** Description changed: I have a couple of ThinkPads with old Intel GMA X4500 graphics. Since - the update to Firefox 95, it's been verry laggy; especially noticeable + the update to Firefox 95, it's been very laggy; especially noticeable while scrolling, for instance on about:support. Strangely, the bug is less present when the browser window is smaller. A maximized window lags very badly, but when resizing the window to under ~75% of the screen, it becomes a lot better. I have tried completely clean profiles by renaming ~/snap/firefox, but this made no difference. I have a feeling that EGL has something to do with it. When I force the Firefox snap to run on Xwayland by running `WAYLAND_DISABLE=1 snap run firefox`, the bug is *not* present. When I run the Firefox 95 deb (from jammy) on Wayland, by running `MOZ_ENABLE_WAYLAND=1 firefox`, the bug is also present. (When I run the deb without that environment variable, it falls back to Xwayland, which works normally.) However, when I set gfx.x11-egl.force-enabled to true in about:config, it also lags. One may assume that EGL is simply broken on this chipset, but that is not the case. When I run the Firefox *94* deb (from focal) with `MOZ_ENABLE_WAYLAND=1`, it works fine. Also, when I run `snap revert firefox` to go back to 94.0.2-2, the bug is not present, even when running on Wayland, using EGL. I have tested the snap both on focal and jammy on the same hardware. The bug is identical in both cases. - - tl;dr: On old Intel graphics Firefox 94 was working well with GLX and EGL, while EGL seems broken on Firefox 95. + tl;dr: On old Intel graphics Firefox 94 was working well with GLX and + EGL, while EGL seems broken on Firefox 95.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1953685 Title: [Regression] Firefox 95 is laggy on GMA X4500 (EGL related?) Status in firefox package in Ubuntu: New Bug description: I have a couple of ThinkPads with old Intel GMA X4500 graphics. Since the update to Firefox 95, it's been very laggy; especially noticeable while scrolling, for instance on about:support. Strangely, the bug is less present when the browser window is smaller. A maximized window lags very badly, but when resizing the window to under ~75% of the screen, it becomes a lot better. I have tried completely clean profiles by renaming ~/snap/firefox, but this made no difference. I have a feeling that EGL has something to do with it. When I force the Firefox snap to run on Xwayland by running `WAYLAND_DISABLE=1 snap run firefox`, the bug is *not* present. When I run the Firefox 95 deb (from jammy) on Wayland, by running `MOZ_ENABLE_WAYLAND=1 firefox`, the bug is also present. (When I run the deb without that environment variable, it falls back to Xwayland, which works normally.) However, when I set gfx.x11-egl.force-enabled to true in about:config, it also lags. One may assume that EGL is simply broken on this chipset, but that is not the case. When I run the Firefox *94* deb (from focal) with `MOZ_ENABLE_WAYLAND=1`, it works fine. Also, when I run `snap revert firefox` to go back to 94.0.2-2, the bug is not present, even when running on Wayland, using EGL. I have tested the snap both on focal and jammy on the same hardware. The bug is identical in both cases. tl;dr: On old Intel graphics Firefox 94 was working well with GLX and EGL, while EGL seems broken on Firefox 95. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1953685/+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
