(In reply to Michel Dänzer from comment #1)
> FWIW, this only takes a few milliseconds on my systems.

Thank you for testing that. Could you please list the details for one of these
systems (hardware, Linux version, X server versions, …)?

> You'd have to profile where the time is spent on your system, but it's more
> likely somewhere between glamor and Mesa / LLVM than in the kernel.

Interesting. Is there a debug switch for the module glamoregl or do I need to
use something like `perf` or `oprofile`?