| 2021-12-09 00:53:24 |
Kevin Keijzer |
description |
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 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. |
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. |
|
