Js client performance when running intensive tasks can become a headache due to the single threaded nature of javascript.

Some ways to tackle this are:

• web workers
• requestAnimationFrame
• requestIdleCallback

Demo: https://js-perf-example.netlify.com/

Further readings and sources:

• https://developer.mozilla.org/en-US/docs/Tools/Performance/Scenarios/Intensive_JavaScript
• https://hacks.mozilla.org/2016/11/cooperative-scheduling-with-requestidlecallback/
• https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Performance_best_practices_for_Firefox_fe_engineers