Benchmark Builder

Results use performance.now() which provides sub-millisecond precision. However, browser JIT compilation, garbage collection, and tab throttling can affect measurements. Run multiple iterations and treat results as relative comparisons, not absolute numbers.

JavaScript engines optimize hot code paths over time (JIT warm-up). Background tasks, garbage collection pauses, and browser resource management all introduce variability. Higher iteration counts produce more stable averages.

No — this tool benchmarks synchronous JavaScript snippets only. Each snippet is wrapped in a function and called in a tight loop. For async benchmarks you'd need a specialized tool that awaits each iteration.