jlfwong / speedscope / 5408710094

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Improve profile builder performance (#437)

Follow up on this PR #435. 

Currently, it took roughly 22 seconds to load my 1.3GB file. After inspecting the profiler, there's a large chunk of time spending in Frame.getOrInsert. I figure we can reduce the number of invocations by half. It reduces the load time to roughly 18 seconds.I also tested with a smaller file (~350MB), and it show similar gains, about 15-20%

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