sl0p: add fastdev build profile + SPEED.md (60x faster iteration)

Building this fork for local use took ~3 minutes per one-line change:
[profile.release] sets lto = true and codegen-units = 1, so every rebuild
redid whole-program optimization on a single core. That is right for a
shipped artifact and pure waste for a binary we just want to look at in a
terminal - zellij is bound on a human, not on codegen.

[profile.fastdev] inherits release, keeps opt-level 3, drops LTO, uses 16
codegen units and keeps the incremental cache:

  cargo build --profile fastdev -p zellij   ~2.8s incremental (was ~3min)

[profile.release] is deliberately untouched, so shipping/benchmarking builds
are unchanged.

.fastfeedback/SPEED.md records the narrow commands, measured timings, the
deploy loop, and - importantly - the PRE-EXISTING test failure baselines
(30 in zellij-server, 5 in zellij-utils) so a future session does not waste
time chasing failures it did not cause.

Rejected: the gold linker (rustc warns it is deprecated with known Rust
bugs) and clang+lld (no lld binary installed). Dropping LTO removed the
dominant cost anyway.

6 files changed, 905 insertions, 0 deletions

diff --git a/.fastfeedback/SPEED.md b/.fastfeedback/SPEED.md
new file mode 100644
index 00000000..4643370f
--- /dev/null
+++ b/.fastfeedback/SPEED.md
@@ -0,0 +1,81 @@
+# SPEED — zellij (sl0p fork)
+
+_Read this BEFORE running anything slow._
+
+The single biggest trap in this repo: **`cargo build --release` takes ~3 minutes for a
+one-line change.** `[profile.release]` sets `lto = true` + `codegen-units = 1`, so every
+rebuild redoes whole-program optimization on one core. That is correct for shipping and
+absurd for iteration.
+
+Use the `fastdev` profile instead. Same `opt-level = 3`, no LTO, 16 codegen units,
+incremental cache kept.
+
+---
+
+## Commands
+
+```bash
+# cheap gate — ALWAYS before test/build
+cargo check -p zellij-server                 # ~7s incremental
+
+# narrow test — DEFAULT RUNG
+cargo test -p zellij-server --lib ui::pane_boundaries_frame    # ~5s incremental
+cargo test -p zellij-utils  --lib gap_and_padding_tests        # ~5s incremental
+
+# deployable binary for looking at it in a terminal
+cargo build --profile fastdev -p zellij      # ~3s incremental  -> target/fastdev/zellij
+
+# real release (shipping / benchmarking only)
+cargo build --release -p zellij              # ~3min  <-- BACKGROUND ONLY
+
+# full suite — BACKGROUND ONLY, once, at the gate
+bgrun run suite -- cargo test -p zellij-server --lib
+bgrun check suite
+```
+
+## Measured timings
+
+| command | time | notes |
+|---|---|---|
+| `cargo build --profile fastdev -p zellij` (incremental) | **2.8s** | zellij-server edit + relink |
+| `cargo build --profile fastdev -p zellij` (cold) | 2m29s | one-time, per profile |
+| `cargo build --release -p zellij` (incremental) | **~3min** | LTO + codegen-units=1. Avoid in the loop. |
+| `cargo test -p zellij-server --lib <filter>` (incremental) | 4.8s | compile dominates; run is ~0.0s |
+| `cargo test -p zellij-server --lib` (full) | ~7s run | after compile; **30 pre-existing failures** |
+| `cargo test -p zellij-utils --lib` (full) | ~0.3s run | **5 pre-existing failures** |
+
+## Deploy loop (what we actually do)
+
+```bash
+cargo build --profile fastdev -p zellij \
+  && rm -f ~/bin/zellij \
+  && cp target/fastdev/zellij ~/bin/zellij    # rm first: "Text file busy" if running
+```
+Then start a **new session** — a running server keeps its old inode. Config-only changes
+(`gap`/`padding`/`title_alignment`) hot-reload; renderer changes do not.
+
+## KNOWN-PRE-EXISTING FAILURES (not regressions — do not chase)
+
+- `zellij-server --lib`: **30 failures** on a pristine tree (mostly
+  `tab::tab_integration_tests::*`, `screen::screen_tests::*`).
+- `zellij-utils --lib`: **5 failures** (`setup::setup_test::*` snapshot tests).
+
+Always compare against baseline before believing you broke something:
+```bash
+git stash && cargo test -p zellij-server --lib 2>&1 | tail -3 && git stash pop
+```
+
+## SLOW TRAPS
+
+- `cargo build --release` in the inner loop — 60x slower than `fastdev` for no benefit.
+- `cargo clean` — forfeits the incremental cache; never without evidence of a stale artifact.
+- `cargo check --workspace --all-targets` — fails on missing **debug-profile** wasm plugin
+  assets (`target/wasm32-wasip1/debug/*.wasm`). Not a real error. Use `-p <crate> --all-targets`.
+- The gold linker "works" but rustc warns it is deprecated with known Rust bugs. `lld` is
+  NOT installed (only `rust-lld` inside the toolchain, which needs nightly flags to use).
+  Not worth it — dropping LTO already removed the dominant cost.
+
+## Fork context
+
+Branch `sl0p/base`. `main` tracks upstream and is left clean.
+Custom options live in `ui { pane_frames { title_alignment, gap, padding } }`.
diff --git a/.fastfeedback/fastdev-cold.cmd b/.fastfeedback/fastdev-cold.cmd
new file mode 100644
index 00000000..24eb5bb4
--- /dev/null
+++ b/.fastfeedback/fastdev-cold.cmd
@@ -0,0 +1 @@
+cargo build --profile fastdev -p zellij 
diff --git a/.fastfeedback/fastdev-cold.exit b/.fastfeedback/fastdev-cold.exit
new file mode 100644
index 00000000..573541ac
--- /dev/null
+++ b/.fastfeedback/fastdev-cold.exit
@@ -0,0 +1 @@
+0
diff --git a/.fastfeedback/fastdev-cold.log b/.fastfeedback/fastdev-cold.log
new file mode 100644
index 00000000..130a84d7
--- /dev/null
+++ b/.fastfeedback/fastdev-cold.log
@@ -0,0 +1,800 @@
+   Compiling proc-macro2 v1.0.107
+   Compiling quote v1.0.47
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+   Compiling ansi_term v0.12.1
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+   Compiling zellij-utils v0.45.0 (/home/user/lol/zellij/zellij-utils)
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::ActionName::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:105:35
+    |
+105 |         match ProtobufActionName::from_i32(protobuf_action.name) {
+    |                                   ^^^^^^^^
+    |
+    = note: `#[warn(deprecated)]` on by default
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:134:44
+    |
+134 |                         ProtobufInputMode::from_i32(switch_to_mode_payload.input_mode)
+    |                                            ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:147:48
+    |
+147 | ...                   ProtobufInputMode::from_i32(switch_to_mode_payload.input_mode)
+    |                                          ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:184:50
+    |
+184 |                         ProtobufResizeDirection::from_i32(move_focus_payload)
+    |                                                  ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:194:50
+    |
+194 |                         ProtobufResizeDirection::from_i32(move_focus_or_tab_payload)
+    |                                                  ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:205:64
+    |
+205 |                         .and_then(|d| ProtobufResizeDirection::from_i32(d))
+    |                                                                ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::pane_frame_style::PaneFrameStyle::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:313:51
+    |
+313 |                     match ProtobufPaneFrameStyle::from_i32(payload.pane_frame_style) {
+    |                                                   ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:332:64
+    |
+332 |                         .and_then(|d| ProtobufResizeDirection::from_i32(d))
+    |                                                                ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:350:64
+    |
+350 |                         .and_then(|d| ProtobufResizeDirection::from_i32(d))
+    |                                                                ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:401:64
+    |
+401 |                         .and_then(|d| ProtobufResizeDirection::from_i32(d))
+    |                                                                ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::UnblockCondition::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:541:70
+    |
+541 | ...                   .and_then(|uc| ProtobufUnblockCondition::from_i32(uc))
+    |                                                                ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::MoveTabDirection::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:621:74
+    |
+621 |                     let direction: Direction = ProtobufMoveTabDirection::from_i32(move_tab_payload)
+    |                                                                          ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::SearchDirection::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:788:57
+    |
+788 |                     direction: ProtobufSearchDirection::from_i32(search_direction)
+    |                                                         ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::SearchOption::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/action.rs:798:59
+    |
+798 | ...                   option: ProtobufSearchOption::from_i32(search_option)
+    |                                                     ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::UnblockCondition::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/action.rs:1054:66
+     |
+1054 |                         .and_then(|uc| ProtobufUnblockCondition::from_i32(uc))
+     |                                                                  ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/action.rs:2108:52
+     |
+2108 |             .and_then(|d| ProtobufResizeDirection::from_i32(d))
+     |                                                    ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::BareKey::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/action.rs:2262:47
+     |
+2262 |         let bare_key = match ProtobufBareKey::from_i32(protobuf_key.bare_key) {
+     |                                               ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::KeyModifier::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/action.rs:2311:59
+     |
+2311 |             let key_modifier = match ProtobufKeyModifier::from_i32(modifier) {
+     |                                                           ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::UnblockCondition::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/action.rs:2413:41
+     |
+2413 |         match ProtobufUnblockCondition::from_i32(value) {
+     |                                         ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/action.rs:2542:60
+     |
+2542 |                     .and_then(|d| ProtobufResizeDirection::from_i32(d))
+     |                                                            ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::LayoutConstraint::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/action.rs:2708:57
+     |
+2708 |         let constraint_type = ProtobufLayoutConstraint::from_i32(protobuf.constraint_type)
+     |                                                         ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::action::SplitDirection::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/action.rs:3077:37
+     |
+3077 |             ProtobufSplitDirection::from_i32(protobuf.children_split_direction)
+     |                                     ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::event::EventType::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/event.rs:65:34
+   |
+65 |         match ProtobufEventType::from_i32(protobuf_event.name) {
+   |                                  ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::event::CopyDestination::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/event.rs:124:50
+    |
+124 |                         ProtobufCopyDestination::from_i32(copy_to_clipboard)
+    |                                                  ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/event.rs:567:52
+    |
+567 | ...                   ProtobufInputMode::from_i32(imk.mode)?.try_into().ok()?;
+    |                                          ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::event::HostTerminalThemeIndication::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/event.rs:590:69
+    |
+590 |                     let mode = ProtobufHostTerminalThemeIndication::from_i32(p.mode)
+    |                                                                     ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::event::MouseEventName::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/event.rs:1653:31
+     |
+1653 |         match MouseEventName::from_i32(mouse_event_payload.mouse_event_name) {
+     |                               ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/event.rs:1956:32
+     |
+1956 |             ProtobufInputMode::from_i32(protobuf_mode_update_payload.current_mode)
+     |                                ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/event.rs:1961:48
+     |
+1961 |             .and_then(|b_m| ProtobufInputMode::from_i32(b_m)?.try_into().ok());
+     |                                                ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/event.rs:1967:68
+     |
+1967 |                     let input_mode: InputMode = ProtobufInputMode::from_i32(k.mode)
+     |                                                                    ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::event::WebSharing::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/event.rs:1998:47
+     |
+1998 |             .and_then(|w| ProtobufWebSharing::from_i32(w))
+     |                                               ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::event::PaneFrameStyle::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/event.rs:2020:51
+     |
+2020 |             .and_then(|p| ProtobufPaneFrameStyle::from_i32(p))
+     |                                                   ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::event::EventType::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/event.rs:2165:48
+     |
+2165 |             .filter_map(|i| ProtobufEventType::from_i32(*i))
+     |                                                ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::event::PaneType::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/event.rs:3111:33
+     |
+3111 |         match ProtobufPaneType::from_i32(protobuf_pane_id.pane_type) {
+     |                                 ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::event::WebServerStatusIndication::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/event.rs:3203:42
+     |
+3203 |         match WebServerStatusIndication::from_i32(
+     |                                          ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/input_mode.rs:55:28
+   |
+55 |         ProtobufInputMode::from_i32(protobuf_input_mode.input_mode)
+   |                            ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::key::key::NamedKey::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/key.rs:19:45
+   |
+19 |                 let key = ProtobufNamedKey::from_i32(key_index).ok_or("invalid_key")?;
+   |                                             ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::key::key::KeyModifier::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/key.rs:90:38
+   |
+90 |                 ProtobufKeyModifier::from_i32(main_modifier)
+   |                                      ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::key::key::KeyModifier::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/key.rs:97:38
+   |
+97 |                 ProtobufKeyModifier::from_i32(key_modifier)
+   |                                      ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::pipe_message::PipeSource::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/pipe_message.rs:12:33
+   |
+12 |             ProtobufPipeSource::from_i32(protobuf_pipe_message.source),
+   |                                 ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::plugin_command::FixedOrPercent::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/plugin_command.rs:176:61
+    |
+176 |                 .and_then(|x| match ProtobufFixedOrPercent::from_i32(x.r#type) {
+    |                                                             ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::plugin_command::FixedOrPercent::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/plugin_command.rs:187:61
+    |
+187 |                 .and_then(|y| match ProtobufFixedOrPercent::from_i32(y.r#type) {
+    |                                                             ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::plugin_command::FixedOrPercent::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/plugin_command.rs:197:47
+    |
+197 |                 match ProtobufFixedOrPercent::from_i32(width.r#type) {
+    |                                               ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::plugin_command::FixedOrPercent::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/plugin_command.rs:208:47
+    |
+208 |                 match ProtobufFixedOrPercent::from_i32(height.r#type) {
+    |                                               ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::plugin_command::PaneType::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/plugin_command.rs:302:33
+    |
+302 |         match ProtobufPaneType::from_i32(protobuf_pane_id.pane_type) {
+    |                                 ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/plugin_command.rs:661:28
+    |
+661 |         ProtobufInputMode::from_i32(key_to_rebind.input_mode)?
+    |                            ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/plugin_command.rs:677:28
+    |
+677 |         ProtobufInputMode::from_i32(key_to_unbind.input_mode)?
+    |                            ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::plugin_command::CommandName::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/plugin_command.rs:687:28
+    |
+687 |         match CommandName::from_i32(protobuf_plugin_command.name) {
+    |                            ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::input_mode::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/plugin_command.rs:897:46
+    |
+897 |                     match ProtobufInputMode::from_i32(switch_to_mode_payload.input_mode) {
+    |                                              ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::pane_frame_style::PaneFrameStyle::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/plugin_command.rs:1133:51
+     |
+1133 |                     match ProtobufPaneFrameStyle::from_i32(payload.pane_frame_style) {
+     |                                                   ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::plugin_permission::PermissionType::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/plugin_command.rs:1294:69
+     |
+1294 | ...                   .filter_map(|p| ProtobufPermissionType::from_i32(*p))
+     |                                                               ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::plugin_command::HttpVerb::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/plugin_api/plugin_command.rs:1402:56
+     |
+1402 |                     let verb = match ProtobufHttpVerb::from_i32(web_request_payload.verb) {
+     |                                                        ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeAction::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/resize.rs:15:29
+   |
+15 |         match ResizeAction::from_i32(protobuf_resize.resize_action) {
+   |                             ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/resize.rs:41:44
+   |
+41 |             .and_then(|r| ResizeDirection::from_i32(r))
+   |                                            ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeAction::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/resize.rs:49:42
+   |
+49 |         let resize = match ResizeAction::from_i32(protobuf_resize.resize_action) {
+   |                                          ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::resize::ResizeDirection::from_i32`: Use the TryFrom<i32> implementation instead
+  --> zellij-utils/src/plugin_api/resize.rs:84:32
+   |
+84 |         match ResizeDirection::from_i32(protobuf_move_direction.direction) {
+   |                                ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::style::ThemeHue::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/style.rs:208:42
+    |
+208 |             theme_hue: ProtobufThemeHue::from_i32(protobuf_palette.theme_hue)
+    |                                          ^^^^^^^^
+
+warning: use of deprecated associated function `plugin_api::generated_api::api::style::ColorType::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/plugin_api/style.rs:318:34
+    |
+318 |         match ProtobufColorType::from_i32(protobuf_color.color_type) {
+    |                                  ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::BareKey::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/enum_conversions.rs:127:23
+    |
+127 |         ProtoBareKey::from_i32(value).ok_or_else(|| anyhow!("Invalid BareKey value: {}", value))?;
+    |                       ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::KeyModifier::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/enum_conversions.rs:136:44
+    |
+136 |     let proto_modifier = ProtoKeyModifier::from_i32(value)
+    |                                            ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::ResizeCause::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/protobuf_conversion.rs:217:47
+    |
+217 |                 let cause = ProtoResizeCause::from_i32(resize.cause)
+    |                                               ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::HostTerminalThemeIndication::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/protobuf_conversion.rs:309:68
+    |
+309 |                 let proto_mode = ProtoHostTerminalThemeIndication::from_i32(msg.mode)
+    |                                                                    ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::ExitReason::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/protobuf_conversion.rs:444:58
+    |
+444 |                 let proto_exit_reason = ProtoExitReason::from_i32(exit.exit_reason)
+    |                                                          ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::OnForceClose::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/protobuf_conversion.rs:864:51
+    |
+864 |                 .map(|o| match ProtoOnForceClose::from_i32(o) {
+    |                                                   ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::Clipboard::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/protobuf_conversion.rs:876:48
+    |
+876 |                 .map(|c| match ProtoClipboard::from_i32(c) {
+    |                                                ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::WebSharing::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/protobuf_conversion.rs:901:49
+    |
+901 |                 .map(|w| match ProtoWebSharing::from_i32(w) {
+    |                                                 ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::MobileLayout::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/protobuf_conversion.rs:931:51
+    |
+931 |                 .map(|m| match ProtoMobileLayout::from_i32(m) {
+    |                                                   ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::NestedSessionHandling::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/ipc/protobuf_conversion.rs:948:60
+    |
+948 |                 .map(|n| match ProtoNestedSessionHandling::from_i32(n) {
+    |                                                            ^^^^^^^^
+
+warning: use of deprecated associated function `client_server_contract::client_server_contract::InputMode::from_i32`: Use the TryFrom<i32> implementation instead
+    --> zellij-utils/src/ipc/protobuf_conversion.rs:3307:27
+     |
+3307 |     match ProtoInputMode::from_i32(i) {
+     |                           ^^^^^^^^
+
+warning: use of deprecated associated function `nested_session_contract::nested_session_contract::NestedCapability::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/nested_session.rs:107:57
+    |
+107 |             |capability| match proto::NestedCapability::from_i32(*capability) {
+    |                                                         ^^^^^^^^
+
+warning: use of deprecated associated function `nested_session_contract::nested_session_contract::NestedDirection::from_i32`: Use the TryFrom<i32> implementation instead
+   --> zellij-utils/src/nested_session.rs:128:35
+    |
+128 |     match proto::NestedDirection::from_i32(direction) {
+    |                                   ^^^^^^^^
+
+   Compiling zellij-client v0.45.0 (/home/user/lol/zellij/zellij-client)
+   Compiling zellij-server v0.45.0 (/home/user/lol/zellij/zellij-server)
+warning: field `stacked_pane_list` is never read
+  --> zellij-server/src/panes/tiled_panes/mod.rs:76:5
+   |
+67 | pub struct TiledPanes {
+   |            ---------- field in this struct
+...
+76 |     stacked_pane_list: Rc<RefCell<bool>>,
+   |     ^^^^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
+
+warning: `zellij-utils` (lib) generated 71 warnings
+warning: `zellij-server` (lib) generated 1 warning
+    Finished `fastdev` profile [optimized] target(s) in 2m 29s
diff --git a/.fastfeedback/fastdev-cold.pid b/.fastfeedback/fastdev-cold.pid
new file mode 100644
index 00000000..6d2b7cb5
--- /dev/null
+++ b/.fastfeedback/fastdev-cold.pid
@@ -0,0 +1 @@
+223126
diff --git a/Cargo.toml b/Cargo.toml
index fa783344..42772834 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -135,6 +135,27 @@ lto = true
 strip = true
 codegen-units = 1
 
+# sl0p: fast iteration profile for locally-deployed builds.
+#
+# `release` is tuned for shipping: fat LTO plus codegen-units = 1 means every
+# rebuild redoes whole-program optimization on a single core, which costs ~3
+# minutes per one-line change. For a build we are only going to look at in a
+# terminal that is pure waste - zellij is I/O bound on a human, not on codegen.
+#
+# This keeps opt-level 3 (so it still feels like a real build) but drops LTO,
+# parallelises codegen across cores, and keeps the incremental cache.
+#
+#   cargo build --profile fastdev -p zellij   ->  target/fastdev/zellij
+#
+# Use `--release` for anything you actually ship or benchmark.
+[profile.fastdev]
+inherits = "release"
+lto = false
+codegen-units = 16
+strip = false
+incremental = true
+debug = false
+
 [package.metadata.deb]
 depends = "$auto"
 license-file = ["LICENSE.md", "4"]