client side performance testing

i wanted to test web based software where java script play significant role.i want to check the performance ,can anyone suggest good tool. also iwant to automate the same.

Note : iam using jmeter for perf开发者_高级运维ormance testing now.

Check out Yslow in firefox

https://addons.mozilla.org/en-US/firefox/addon/yslow/

With Firebug, you can use

console.time("name");
console.timeEnd("name");

or

console.profile();
console.profileEnd();

around a specific block of JS

I guess you could write a firebug plugin to somewhat automate it but it's more for looking for specific things.