Measuring/benchmarking your Magento with Siege, ab, Magento profiler, YSlow, Page Speed, GTmetrix, and WebPagetest
The very first task of any website's performance optimization is to know its pitfalls. In other words, know why it is taking too much time. Who are the culprits? Fortunately, we have some amicable friends who will guide us through. Let's list them:
ab (ApacheBench): This is bundled with every Apache as a benchmarking utility.
Siege: This is an open source stress/regression test and benchmark utility by Joe Dog.
Magento profiler: This is a built-in Magento profiler.
YSlow: This is a tool from Yahoo! We have been using it for years. This is in fact a firebug add-on.
Page Speed: This is yet another firebug add-on from Google to analyze page ...
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