Closed
Bug 1512555
Opened 7 years ago
Closed 7 years ago
Youtube UI hang/performance bug
Categories
(Firefox :: Untriaged, defect)
Tracking
()
RESOLVED
DUPLICATE
of bug 1512556
People
(Reporter: diggsey, Unassigned)
Details
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0
Steps to reproduce:
Using stable firefox in safe mode (no addons) with youtube's HTML5 player (flash not installed) and regardless of whether hardware acceleration is enabled or not:
- Open a youtube video
- Mouse over the youtube video causing the controls to appear
- Mouse out
- Repeat 4/5 times
Actual results:
Controls took longer to appear each time. By the 5/6th try the entire tab essentially locked up, so there's some serious exponential slow-down going on, far beyond any simple inefficiencies.
The performance tab showed a huge number of DOM events firing in youtube's webcomponents polyfill. I've attached my performance recording - you can see the periods where I mouse over the video and the FPS drops to zero for many seconds, while thousands of DOM events fire.
This bug means I flat out can't use firefox unless there is a workaround.
Expected results:
It should not hang up completely.
Status: UNCONFIRMED → RESOLVED
Closed: 7 years ago
Resolution: --- → DUPLICATE
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Description
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