How to test script execution speed?

Question

JavaScript

Maybe someone knows the most convenient way to test the speed of script execution.
Need to explore a couple of scripts without a website.

Answer 1

- Раставить счетчики «руками» `new Date().getTime()`, `Date.now()` или `performance.now()`;
- console.time
- console.profile
- https://benchmarkjs.com/
- https://jsperf.com/ или https://jsbench.github.io/

Answer 2

It seems that developer tools in browsers have such a feature.

Answer 3

The easiest way is to create a new date at the beginning of the script and then a new date at the end of the script. Subtract the first from the second and get the execution speed in milliseconds. https://yutex.ru/knowledgebase.html?article=85
Or you can use decorators for functions learn.javascript.ru/decorators