Benchmark Builder
Paste two JavaScript snippets and benchmark them side-by-side with configurable iterations and optional setup code.
Snippet A
Snippet B
How to use Benchmark Builder
- Paste JavaScript code into Snippet A and Snippet B.
- Optionally add shared setup code and adjust iterations.
- Click Run Benchmark to compare performance.
What is Benchmark Builder?
A benchmark builder measures the execution time of two JavaScript code snippets over many iterations, showing relative performance with ops/sec metrics and a visual comparison bar. Developers use this to compare algorithms, data structure operations, and library performance.
Uses high-resolution performance.now() timing. The setup field lets you define variables that both snippets share.
FAQ
- Are results reliable?
- Results are indicative, not absolute. JIT compilation, garbage collection, and browser state can affect timing. Run multiple times for confidence.
- What should I put in the setup field?
- Any code that both snippets need — variable declarations, data generation, etc. It runs once before the benchmark loop.
Related tools
People also use
- CSV ↔ JSON🗄️ Developer Tools
CSV ↔ JSON — Convert tabular data between CSV and JSON. Header row detection, custom delimiter, quoted-field-with-comma support.
- HTML CSS JS Minifier🗄️ Developer Tools
Free online code minifier. Compress HTML, CSS, and JavaScript code instantly in one place. Removes comments, whitespace, and formatting to optimize speed.
- HTML/CSS/JS Sandbox🗄️ Developer Tools
Write HTML, CSS, JS in tabbed editors with live iframe preview. Auto-run, download as HTML file. Preloaded counter app sample. No server — pure browser.