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If you are using Java or JVM languages and are interested in performance:

This is the greatest thing since sliced bread: github.com/jvm-profiling-tools

All my attempts to understand what's going on on this app I'm working on didn't work out - Yourkit was terrible slow to trace calls and I got lost in the details - but just one .svg flamegraph from this tool solved quite a few problems. And it's also doing heap and allocation profiling!

Last but not least: works at native speed.

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