The freezes are not caused by shader compilation. I don't know what's causing
them. They are too long (even 10 seconds). A CPU profiler shows the time is not
spent in the driver. It's spent in RocketLeague. The game is doing something
and I can't see what, because it doesn't come with debug info. Some time is
spent in sched_yield, which suggests that the game is in a loop waiting for
something. This issue might not be related to the GL driver even.