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Importing from Chrome
To record a performance profile in Chrome, open the developer tools and switch to the performance tab.
Click the record button.
When you're done recording, click the "Stop" button.
When it's finished processing, click the "Save profile" button.
This should save as a filename like
You should be able to open that file in https://www.speedscope.app/.
To view it offline, you'll need to install speedscope via
npm install -g speedscope
Then you should be able to open it like so: