How to measure code execution time in VBScript or JavaScript?

Question

What is a good way to measure code execution time in VBScript?

Or failing that how to do it in JavaScript?

Answer 1

This is a great article on JavaScript timing, from the book "Even Faster Websites". Two things to keep in mind are that JavaScript Date objects often have a resolution as big as 15ms (this varies by browser and operating system), and most profilers have an observer effect. Note that Google Speed Tracer (new since the article was published) runs out of process and collects data asynchronously to minimize the observer effect.