Fishbowl regression
The Fishbowl demo (gtk4-demo --run fishbowl) used to perform very impressively here, as in maintaining steady 60 FPS with a thousand of icons or so. But in recent builds of GTK 4, this has regressed: now only a few (like in the range of 1 to 8) icons ever appear.
git bisect points to c227493c (of !5944 (merged)) as the guilty commit.
Before (on 30acf00b):
After (on c227493c):
