(In reply to comment #9) > I have tried to take an apitrace but apitrace segfaults (?) when replaying > it, so I can post that too when I can resolve that. That was actually just my failure to use it correctly. With apitrace replay --core it works: 64 Megabyte download, 101 Megabyte uncompressed: http://w3studi.informatik.uni-stuttgart.de/~haagch/UpvoidEngine.trace.bz2 Replaying this renders on intel without bigger problems, but on my HD 7970M it creates GPU faults (but not so much that it causes a lockup).