Comment 16 for bug 1788665

I find it interesting this is a slow down with PCI passthrough - that's pretty much the case you'd expect there to be least change; it shouldn't be generating lots of vm exit's for example which you'd expect could have been made slower by the recent security changes.

I suppose one thing you could try is profiling on the host to see if more time is spent in the host kernel or qemu when running the 2d tests with the new vs older windows; if it points to some particular hot spot there then perhaps it might be possible to understand why.