This is a known issue for software-rendered windows that update rapidly.
There are several reasons for it so also several possible solutions...
* GTK 3.x is software-rendered, so rapid window redraws that require
uploading new frames to the GPU from the CPU may be slow. This is mostly
fixable by changing GTK to hardware rendering (coming in GTK 4.0).
* Wayland lacks 2D acceleration options that Xorg has. However those
could plausibly be emulated by modifying the GTK 3.x code in theory.
* The EGLNative platform (that used by "Wayland" sessions) in Mutter
/Gnome-Shell is generally slower than the X11 platform. It doesn't have
to be. It's just a younger less mature platform, which we're trying to
improve. Fixes for this would come in the 'mutter' project.
** Changed in: gnome-terminal (Ubuntu)
Importance: Undecided => Medium
** Changed in: gtk+3.0 (Ubuntu)
Importance: Undecided => Medium
** Changed in: mutter (Ubuntu)
Importance: Undecided => Medium
** Changed in: gtk+3.0 (Ubuntu)
Status: New => Triaged
** Changed in: mutter (Ubuntu)
Status: New => Triaged
** Summary changed:
- Terminal laggs (low fps) the whole desktop when fast output
+ Terminal lags (low FPS) the whole desktop when fast output
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Desktop Bugs, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/1746949
Title:
Terminal lags (low FPS) the whole desktop when fast output
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