macOS Big Sur 11.5
glade: stable 3.38.2
I encountered some lag problems when using glade, which is similar to this problem (Glade renders extremely slow on Mac OS)[Glade renders extremely slow on Mac OS (#442) · Issues · GNOME / Glade · GitLab], and I try to run gtk3-widget-factory is also very slow.
Yes, it’s a known problem with GTK3 on Big Sur, see drawRect consumes excessive CPU cycles on macOS Big Sur (#3714) · Issues · GNOME / gtk · GitLab. Eventually a solution will arrive, but for the time being you can try using a VM or Cambalache (which is really new)
Note: it’s extremely unlikely GTK3 will ever be fixed on macOS. The only known fix is to change the rendering pipeline, and that’s done in GTK4.
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