User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0 Steps to reproduce: 1.enable WR 2. unzip the attachment (a large perf-html profile)) 3. Go to https://perf-html.io/ 4. Drag and drop the profile there 5. Wait till the profile loads 6. Mouse over the different icons on the tab-bar (download arrow, profiler button, library button, hamburger button etc) Actual results: The hover effect on the icons is laggy. CPU use is high (50% of my 2c/4T processor) https://perfht.ml/2z4HoYa Expected results: not so Heavy page content should not affect the animations of the UI
maybe slightly better profile: https://perfht.ml/2OAVaGM Also STR is a little modified: Steps 1-5 are same 6. Show only the content process 3 7. Invert the callstack 8. Highlight the topmost function of the content (NTWaitforAlertByThreadID) 8. Mouseover the icons of the tab-bar OR highlight different functions of the inverted stack list. The highlighting is also laggy
Actually, this testcase is overly complicated. No need to all of that. Will close this, and open a new bug with simpler testcase. Also, this might just be the document splitting work.
Status: NEW → RESOLVED
Last Resolved: 5 months ago
Resolution: --- → WORKSFORME
Simpler STR: 1. Go to Just go to https://ci.chromium.org/p/chromium/g/main/console?limit=500 , 2. Put mouse cursor over the tab bar/the address bar 3. Let the page settle 4. Move ,ouse over the downloads/extensions/library icons. Slow movement.
Summary: On a heavy per-html page, mousing over the different icons on the tab-bar(download arrow, profiler button, library button, hamburger button etc) is janky → On a heavy page, mousing over the different icons on the tab-bar(download arrow, profiler button, library button, hamburger button etc) is janky
Resolution: WORKSFORME → DUPLICATE
Duplicate of bug: document-splitting
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