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arkonandClaude Opus 4.7
1c3f2f6571
CLAUDE.md: fix stale counts (types 14 to 15, SSE events ~118 to ~120), remove redundant footer sections (References list duplicated inline citations; Common Workflows bullets were self-evident or already stated; Tunnel/Memory Leak Prevention folded into neighboring sections). 251 to 234 lines. Move 22 completed implementation/phase/audit plans to docs/archive/ via git mv so history is preserved. Living reference docs remain in docs/. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
75 lines
4.0 KiB
Markdown
75 lines
4.0 KiB
Markdown
# Codeman Performance Optimization Plan
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## Current State
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The backend is **already production-grade** — SSE broadcasting, state persistence, terminal batching, buffer management, and memory patterns are all well-optimized. The biggest gains are on the **frontend delivery** side.
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## Implemented Optimizations
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### 1. V8 Compile Cache (10-20% faster cold start)
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**Files:** `scripts/codeman-web.service`, `package.json`
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Node.js re-parses and compiles all JS on every cold start. `NODE_COMPILE_CACHE` caches V8 compiled bytecode to disk, reusing it on subsequent starts.
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- Added `Environment=NODE_COMPILE_CACHE=/home/arkon/.codeman/compile-cache` to systemd service
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- Added to `npm start` script for non-systemd usage
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- Zero code changes, immediate win on every restart
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### 2. WebGL Addon Lazy-Loading (244KB saved on mobile, non-blocking on desktop)
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**Files:** `src/web/public/index.html`, `src/web/public/app.js`
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`xterm-addon-webgl.min.js` (244KB) was loaded eagerly for all users via `<script defer>`, but only used on desktop with WebGL2 support.
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- Removed `<script defer>` from `index.html`
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- Added dynamic script loading in `app.js` — only downloads on desktop when WebGL is needed
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- Mobile users never download the file at all (244KB saved)
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- Desktop: loads in parallel with page rendering, addon initializes when ready
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- Graceful fallback: canvas renderer used if WebGL unavailable or script fails
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### 3. Preload Hints (~50-100ms faster perceived load)
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**Files:** `src/web/public/index.html`
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Browser discovers `<script defer>` tags only when the parser reaches them at the bottom of `<body>`. By then, the HTML parse has blocked for hundreds of lines.
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- Added `<link rel="preload" as="script">` in `<head>` for `vendor/xterm.min.js`, `constants.js`, `app.js`
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- Browser starts fetching critical scripts immediately during HTML parse (before reaching `<body>`)
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- Zero runtime overhead — just hints for the browser's preload scanner
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### 4. Batch Tmux Reconciliation (N subprocess calls → 1)
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**Files:** `src/tmux-manager.ts`
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`reconcileSessions()` previously called `tmux has-session` + `tmux display-message` per known session, plus `tmux list-sessions` for discovery, plus `tmux display-message` per discovered session. With 20 sessions: 41+ subprocess calls.
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- Replaced with single `tmux list-panes -a -F '#{session_name}\t#{pane_pid}'` call
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- Builds a Map from the result, then does O(1) lookups for both known and discovered sessions
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- Also replaced inner O(n) `isKnown` scan with a Set lookup
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- 20 sessions: 41 subprocess calls → 1, with faster lookups
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### 5. Asset Hashing / Cache Busting (already implemented)
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**Files:** `scripts/build.mjs` (pre-existing)
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Content-hash cache busting was already implemented in the build script:
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- All app JS/CSS files get content hashes (`app.abc123.js`)
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- `index.html` rewritten to reference hashed filenames
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- Pre-compressed with gzip + Brotli
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- 1-year immutable cache works correctly — new deploys get new filenames
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## Already Optimized (No Action Needed)
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| Area | Why It's Fine |
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|------|---------------|
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| **SSE Broadcasting** | Single serialization per broadcast, preformatted frames, backpressure handling, session subscription filtering |
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| **State Persistence** | 500ms debounce, incremental per-session JSON caching, async atomic writes, circuit breaker on failures |
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| **Terminal Batching** | Adaptive intervals (16-50ms), per-session queues, immediate flush at 32KB, array-based accumulation |
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| **Buffer Management** | BufferAccumulator (array-push, lazy join), auto-trim at 2MB/1MB, no string concatenation in hot paths |
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| **ANSI Stripping** | Pre-compiled regex via factory functions, single-pass processing |
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| **Static File Serving** | @fastify/static with 1-year cache, pre-compressed Brotli/gzip, no-cache for HTML |
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| **Memory Management** | CleanupManager, LRUMap, StaleExpirationMap, bounded buffers, explicit listener cleanup |
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| **Import Patterns** | Pure ESM, lazy web server import, no circular deps, no dynamic imports in hot paths |
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| **Config Loading** | Small constant files, no I/O at import time, specific imports (no barrel) |
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