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# speedscope
A high-performance interactive web-based viewer for [sampling profiles][0].
![Example Profile](https://i.imgur.com/lgV2FcP.png)
![Example Profile](https://i.imgur.com/6psEeSp.png)
[0]: https://en.wikipedia.org/wiki/Profiling_(computer_programming)#Statistical_profilers
# Usage
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Currently accepts the same folded stack format as the original FlameGraph scripts do: https://github.com/brendangregg/FlameGraph#2-fold-stacks.
Also accepts CPU profiles recorded with Chrome devtools if saved with a `.json` extension.
For example, try dropping this file onto the browser window: https://raw.githubusercontent.com/jlfwong/speedscope/master/sample/perf-vertx-stacks-01-collapsed-all.txt
To pan, you can either scroll or click and drag.