If you are trying to inspect timings in JavaScript, you can use console.time and console.timeEnd which will write to your browser console.

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Example:

console.time('lengthy calculation');
lengthyCalculation();
console.timeEnd('lengthy calculation');

lengthy calculation: 1.337ms

Note that this allows using console.timeEnd in another context which is helpful when you are doing things asynchronously, or just in different places.

Works in all browsers, including recent Internet Explorers. For older IEs, you may activate Firebug Lite to get these commands.