With 128.7.0esr I'm still seeing this on macOS, but not anymore on linux X11 and windows (thank you!)
1) Open Thunderbird 128.7.0esr 2) Click on any message 3) Go offline and wait for CPU to idle 4) Move mouse up and down above list so that messages highlight, without clicking on anything macOS 14.4.1: CPU jumps to 100% Ubuntu 24.04.1 (X11): CPU remains <10% Windows 10 Pro 22H2: CPU remains <10% Changing settings for gfx.webrender.force-disabled and gfx.webrender.software made no difference on macOS. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to thunderbird in Ubuntu. https://bugs.launchpad.net/bugs/1959747 Title: [upstream] Very high CPU and slow responsiveness in Thunderbird 91-102 Status in Mozilla Thunderbird: Confirmed Status in thunderbird package in Ubuntu: Triaged Bug description: Very high CPU and slow responsiveness in Thunderbird 91.5.0 and later. Just moving the mouse cursor over a message list results in 365% CPU for me. I had to set this in the config editor to fix it: gfx.webrender.force-disabled = TRUE Upstream bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1730423 To manage notifications about this bug go to: https://bugs.launchpad.net/thunderbird/+bug/1959747/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
