Created attachment 8823232 [details] Screenshot_1_3_17__4_38_AM.png User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:53.0) Gecko/20100101 Firefox/53.0 Build ID: 20170102030204 Steps to reproduce: 1. Create large bundle.js with webpack with source maps. 2. Set breakpoint in one of those files. 3. Refresh browser with devtools open. Actual results: Hang. unresponsive script chrome://devtools/content/sour...odemirror/codemirror.bundle.js:1041 Expected results: Performant of course!
Do you have a testcase to reproduce the perf issue?
I can't share the source code. Can you share a large webpack / source map test case you're using for performance? I can try that.
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