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⚡ Bolt: Optimize chat signatures by replacing array joins with string concatenation - #290

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bolt-perf-chat-signatures-8221896123528603125
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bobdivx wants to merge 1 commit into
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bolt-perf-chat-signatures-8221896123528603125

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@bobdivx

@bobdivx bobdivx commented Oct 29, 2026

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💡 What: Replaced Array.prototype.join('|') with direct string concatenation in chat message signature generation (messagesSignature) and ChatThread stick-to-bottom checking (useStickToBottom).

🎯 Why: These functions run frequently (often multiple times per second during chat polling or streaming). Using array instantiations just to join them into strings creates unnecessary intermediate objects, leading to increased memory allocation and garbage collection overhead.

📊 Impact: Reduces memory allocation on hot rendering/polling paths, leading to smoother scrolling and reduced CPU load during active chat streams or long polling cycles.

🔬 Measurement: Run pnpm run test:web to ensure chat logic remains correct. The memory improvement can be verified in a browser profiling session by observing reduced minor GC events during active chat streaming.


PR created automatically by Jules for task 8221896123528603125 started by @bobdivx

… concatenation

Replaces `Array.prototype.join()` with direct string concatenation in chat signature generation loops (`messagesSignature` and `useStickToBottom`). This avoids unnecessary intermediate array allocations, reducing memory overhead and garbage collection pauses on hot paths during frequent polling.

Co-authored-by: bobdivx <6737167+bobdivx@users.noreply.github.com>
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@bobdivx

bobdivx commented Oct 29, 2026

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Closing: replacing a small array .join('|') with string concatenation is a micro-optimization with no measurable gain and makes the code harder to read. Same rationale as #269, #271 and #284.

@bobdivx bobdivx closed this Oct 29, 2026
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Closing: replacing a small array .join('|') with string concatenation is a micro-optimization with no measurable gain and makes the code harder to read. Same rationale as #269, #271 and #284.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.

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