⚡ Bolt: Optimize ShareableArray defragmentation #53
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Replaces the slow DataView byte-by-byte copy loop in `ShareableArray.defragment` with a `Uint8Array` indexed loop. This avoids the overhead of `DataView` methods and the overhead of creating `subarray` views for small objects. Also fixes a bug where `DATA_OBJECT_OFFSET` was added twice to the data pointer, causing 8-byte gaps between objects after defragmentation. Benchmark results (100k items, 50% fragmentation): - Before: ~22ms - After: ~14ms (~35% improvement)
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💡 What: Optimized
ShareableArray.defragmentby usingUint8Arrayfor copying and fixed an offset calculation bug.🎯 Why: Defragmentation was slow due to
DataViewoverhead and manual copying. Additionally, a logic bug caused inefficient memory usage (gaps) after defragmentation.📊 Impact: ~35% speedup in defragmentation for small objects (common case).
🔬 Measurement: Verified with a benchmark script (
benchmark/bench_defragment.ts) and existing tests.PR created automatically by Jules for task 12733662190988430690 started by @pverscha