Scott Barber answered a question on SearchSoftwareQuality.com about how to conduct performance testing without using any tools. He goes on to state that being denied tools is likely a bad idea, but regardless of whether you have great tools (such as BrowserMob) or you have none, there are a lot of areas to focus on in addition to what a load testing tool does:

Now, after saying all of that, I must admit I have found that the vast majority of value that is gained by quality performance testing comes outside of the load-generation tool. Some of my favorite techniques (assuming you are testing websites):

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