User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:54.0) Gecko/20100101 Firefox/54.0 Build ID: 20170313004011 Steps to reproduce: Have a codebase that isnt the most efficient in the world, but works fine on a decent machine. Pre-minification, everything works at roughly the same level of performance on chrome / firefox stable / firefox developer branch. Post minification that isnt the case. You can see the minified version here http://custom.gelaskins.com/312 upload a decent resolution image, and drag it around. You will notice (on a decent machine) you get substancially lower frame rate on FF developer edition. Originally opened this on the create-react-app bug tracker https://github.com/facebookincubator/create-react-app/issues/1809 Actual results: Post minification there is a serious performance degradation for firefox developer edition. This is not present in firefox stable, or in chrome stable. Expected results: I would expect the same performance characteristics pre and post minification.
Component: Untriaged → Developer Tools
Summary: Performance degradation for minified code in firefox developer edition → [prettify] Performance degradation for minified code in firefox developer edition
Component: Developer Tools → Developer Tools: Debugger
Thanks :matt, can you explain how you're minifying your code? Are you using the debugger to prettify the code or are you minifying the code with a build step?
:jlast webpack / uglify. I am using create-react-app from facebook (https://github.com/facebookincubator/create-react-app) to do the minification (if you want to look at exact settings)
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