Gatling is great, and the best thing to use if you want performance and fine grained analysis. It's easy to use, great html output with graphs. You can also output to a bunch of other formats, and easily break out into scala. Don't let the scala put you off though, its mostly a really simple and clean dsl. The docs are good too!

Another +1 for Gatling. Super easy to use, and maybe more importantly, super easy to read the code later and grok exactly what it does. Scales well, too.

+1 for Gatling. It can also output junit reports if that’s something you need too