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perf: optimize hot paths across server, session, and frontend

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- Pre-compile regex patterns (ANSI escape, token parsing) in session.ts
- Optimize SSE broadcast to serialize JSON once for all clients
- Add DOM element caching ($() helper) to avoid repeated getElementById
- Throttle resize observer with dimension change detection
- Use array.join() for session tab HTML building
- Replace DOM-based escapeHtml with regex replacement
- Cache toast container reference

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
arkon
2026-01-19 11:48:02 +01:00
co-authored by Claude Opus 4.5
parent 0af813b3c4
commit ce61a3b2f2
3 changed files with 152 additions and 56 deletions
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src/session.ts
+15 -8
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@@ -26,6 +26,10 @@ const LINE_BUFFER_FLUSH_INTERVAL = 100;
// ^[[I (focus in), ^[[O (focus out), and the enable/disable sequences
const FOCUS_ESCAPE_FILTER = /\x1b\[\?1004[hl]|\x1b\[[IO]/g;
// Pre-compiled regex patterns for performance (avoid re-compilation on each call)
const ANSI_ESCAPE_PATTERN = /\x1b\[[0-9;]*m/g;
const TOKEN_PATTERN = /(\d+(?:\.\d+)?)\s*([kKmM])?\s*tokens/;
export interface ClaudeMessage {
type: 'system' | 'assistant' | 'user' | 'result';
subtype?: string;
@@ -658,8 +662,8 @@ export class Session extends EventEmitter {
for (const line of lines) {
const trimmed = line.trim();
// Remove ANSI escape codes for JSON parsing
const cleanLine = trimmed.replace(/\x1b\[[0-9;]*m/g, '');
// Remove ANSI escape codes for JSON parsing (use pre-compiled pattern)
const cleanLine = trimmed.replace(ANSI_ESCAPE_PATTERN, '');
if (cleanLine.startsWith('{') && cleanLine.endsWith('}')) {
try {
@@ -716,12 +720,12 @@ export class Session extends EventEmitter {
// Parse token count from Claude's status line in interactive mode
// Matches patterns like "123.4k tokens", "5234 tokens", "1.2M tokens"
private parseTokensFromStatusLine(data: string): void {
// Remove ANSI escape codes for cleaner parsing
const cleanData = data.replace(/\x1b\[[0-9;]*m/g, '');
// Remove ANSI escape codes for cleaner parsing (use pre-compiled pattern)
const cleanData = data.replace(ANSI_ESCAPE_PATTERN, '');
// Match patterns: "123.4k tokens", "5234 tokens", "1.2M tokens"
// The status line typically shows total tokens like "1.2k tokens" near the prompt
const tokenMatch = cleanData.match(/(\d+(?:\.\d+)?)\s*([kKmM])?\s*tokens/);
const tokenMatch = cleanData.match(TOKEN_PATTERN);
if (tokenMatch) {
let tokenCount = parseFloat(tokenMatch[1]);
@@ -863,10 +867,13 @@ export class Session extends EventEmitter {
this._currentTaskId = null;
// Kill the associated screen session if requested
if (this._screenSession && this._screenManager && killScreen) {
if (killScreen && this._screenManager) {
// Try to kill screen even if _screenSession is not set (e.g., restored sessions)
try {
await this._screenManager.killScreen(this.id);
console.log('[Session] Killed screen session:', this._screenSession.screenName);
const killed = await this._screenManager.killScreen(this.id);
if (killed) {
console.log('[Session] Killed screen session for:', this.id);
}
} catch (err) {
console.error('[Session] Failed to kill screen session:', err);
}