Open Bug 1492781 Opened Last year Updated Last year
Slow browser connections seem to end up in spin loops
Whenever I'm on a very slow or unresponsive web site, Firefox (recent Nightly on macOS) spins up the CPU hard, causing my laptop's fan to blow and the battery to empty relatively quickly.
Component: General → Networking
Product: Firefox → Core
I do have WebRender enabled, so I was thinking it might even be due to WebRender being inefficient about animating the throbber.
Bug 1461239 fix might make cpu usage more efficient than before.
How much worse is the problem with webrender on vs off?
a URL that simulates "slow connections" is https://jwatt.org/tmp/load-never-finishes.php
WR: https://perfht.ml/2ytk7hm non-WR: https://perfht.ml/2yw9x9o These profiles are after the CPU use has settled down observation: With WR, CPU goes to 100%, then comes down and settles in 10 seconds or so. Spikes a bit during this times Non-WR: settles down almost immediately
Actually, it looks like there's not a big difference for me in terms of WebRender vs non-WebRender. Both end up spinning the CPU hard for me.
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