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## Problem With a huddle open, Buzz Desktop becomes extremely slow and laggy (Tyler, live report, 2026-08-14). Root-caused and runtime-convicted on the instrumented rig in #buzz-conversational-agents: - The Rust playout loop emits `huddle-speaker-levels` over Tauri IPC every 50 ms, unconditionally, for the whole life of a huddle (`playout.rs` `SPEAKER_LEVEL_TICK_MS = 50`). - Each event deserializes to a fresh object, so `setRemoteSpeakerLevels` updates state at 20 Hz even in silence. - `HuddleProvider` wraps the entire main app and its context value was an inline object literal — never memoized. Every level tick minted a new context identity, re-rendering **every** `useHuddle()` consumer, including `ChannelScreen` and message rows. **Measured (A/B, silent one-participant huddle, same channel/state):** ~41 sustained ChannelScreen renders/sec unsuppressed vs ~4/sec with only the speaker-level setState suppressed — the 20 Hz path is ~90% of the load. Receipts: `driver-render-counter-unsuppressed.jsonl` / `-suppressed.jsonl` on the rig, verified independently. The same main-thread churn starves the relay client's 16 ms event-flush timer, which is the delayed/bursty message hydration and thread-panel stalls seen alongside the lag. ## Fix (minimal, no behavior change for meters) 1. **Split the high-frequency fields** (`micLevel`, `activeSpeakers`, `speakerLevels`) out of `HuddleContextValue` into a new `HuddleLevelsContext`, consumed via `useHuddleLevels()` only by the three meter components (`HuddleBar`, `HuddleRoomHeader`, `HuddleProfileControl`). 2. **Memoize the main context value** so provider re-renders no longer mint a new identity for the ~everything that consumes `useHuddle()`. 3. **Extract the mic-level analyser** into `useMicLevelAnalyser` — the level pipeline now lives in one place, and `HuddleContext.tsx` stays under the file-size ratchet (977 lines). Level meters keep their 20-30 Hz updates. Everything else re-renders only when a value it actually consumes changes. ## Acceptance bar With this fix, a silent open huddle should hold `ChannelScreen` at idle render rates (single digits/sec), and message hydration should stay live during huddles. The rig's render-counter + four-clock instrumentation can verify on this branch. ## Validation - `pnpm typecheck` clean - `biome check` clean (repo leftovers in sidebar tests are preexisting on main) - full desktop suite: **4,775 passed, 0 failed** at the final tree - file-size ratchet passes (was the reason for the analyser extraction) - lefthook pre-commit (desktop-fix + signoff) passed on commit Not yet done: live-local A/B rerun on this branch — the rig (Wren/Max) has the instrumentation ready and can convict/acquit the fix with the same probe that convicted the bug. Base: `068a83b0` (main). Co-developed with runtime evidence from Wren and instrumentation by Max. Signed-off-by: Eva <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz> Co-authored-by: Eva <011987e296fd5006292d2f930b574be47c7801048d1983c46c425d3c95f0cffd@buzz.block.builderlab.xyz>