Benchmark Builder
What is a Benchmark Builder?
Compare performance and execution speed of JavaScript code snippets side-by-side. Measures operations per second (ops/sec), average execution latency (ms), and percentage performance differences directly in your browser.
Why Use This Tool?
- JS Optimization: Test whether `for` loops, `Array.map()`, or `for...of` run faster in V8 engines.
- Algorithm Testing: Compare execution speed of string concatenation vs array join or regex parsing.
- Code Refactoring: Ensure refactored code executes faster than legacy code.
How to Use
- Enter Test Code Block A and Test Code Block B.
- Set iteration count or time limit (e.g. 100,000 iterations).
- Click "Run Benchmark" to view ops/sec, execution times, and winner comparison.
Real Working Example
Input:
Snippet A: [1,2,3].map(x => x*2) | Snippet B: for loop array multiplication
Output Result:
Snippet A: 1,240,000 ops/sec | Snippet B: 8,450,000 ops/sec | Winner: Snippet B (581% faster)
Important Technical Details & Formulas
- High-Resolution Timer: Uses `performance.now()` microsecond sampling to avoid timing inaccuracies.
- Warmup Iterations: Runs JIT warmup iterations to ensure accurate V8 engine optimization benchmarking.
- 100% Local Execution: JS code runs locally inside browser web workers.
Related Measurement & Time Tools
- Chronometer: Precision millisecond stopwatch.
- JS Minifier: Minify JavaScript code.
- Code Share: Share code snippet links.
Frequently Asked Questions
How does the benchmark builder measure JS performance?
It executes each function repeatedly over a fixed time window using performance.now() to measure operations per second.
Does it run in a isolated Web Worker?
Yes, benchmarks execute in Web Workers to prevent freezing the UI main thread.
Is it free?
Yes, 100% free.
Are my code snippets sent to a server?
No, all benchmark execution happens 100% locally in your browser.
What is the main function of Benchmark Builder?
Easily compare execution time and operations per second (ops/sec) of JavaScript functions side-by-side in your browser. This tool processes benchmark builder data 100% locally inside your web browser.