var array = Array.from({ length: 10000 }).map((val, i) => i);
var messages = array.slice().splice(9999, 1);
var messages = array.slice().slice(0, 9999);
FAQ: FAQ
Source code: GitHub/MeasureThat.net
Report issues: MeasureThat.net/Issues
Based on: Benchmark.js
Facebook page: https://www.facebook.com/MeasureThat.Net
Python benchmarks support: Pyodide