(In reply to Michel Dänzer from comment #21)

I did several tests multiple times to be sure, and it seems like it. No matter
how much I stress the viewer (a lot of avatars / geometry on the screen)
nothing bad happens with commit 56d9a397aa2dbee6b12e1bbe56be39f426e1e34d. But
the moment I switch to commit edbbfac6cfc634e697d7f981155a5072c52d77ac, it only
takes a bit of content for the GPU to instantly hiccup and only recover if I
move the view down really quick.

Note however that with both of these commits, the scene becomes black when I
enable Advanced Lighting, and I can only see floating text. But that seems to
be a completely unrelated issue, likely added temporarily during this time then
fixed relatively soon... probably something to do with lighting.