https://bugzilla.gnome.org/show_bug.cgi?id=772075
Bug ID: 772075
Summary: GTK+ uses a lot more CPU under Wayland than under X11
Classification: Platform
Product: gtk+
Version: 3.21.x
OS: Linux
Status: NEW
Severity: normal
Priority: Normal
Component: Backend: Wayland
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected], [email protected]
GNOME version: ---
When I run gtk3-demo --run=pixbufs on my Gnome on Wayland session I get around
86% CPU usage. If I run it with GDK_BACKEND=x11 it uses only around 25%.
Perf tells me the biggest offender is
bits_image_fetch_bilinear_affine_normal_a8. Setting a breakpoint in gdb I
noticed it is almost all due to gtk_window_draw drawing client-side
decorations, particularly shadows.
Returning at the top of that function after just chaining up to the parent
brings CPU usage down to ~42%. Still higher than under Xwayland, but much lower
than the original 86%.
This is the biggest drag on the WebKitGTK+ performance at the moment, I
believe. While playing a 4k video the browser spends most of its time painting
the window decoration.
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