Trine 3 [GOG version] takes 50 seconds to load on first run (empty shader
cache). On subsequent runs, it takes 25 seconds (apparently since shader cache
is already populated).

Also, the CPU is loaded for me around 25% during game starting, so it looks
like shader compilation doesn't utilize all available cores.

OS: Debian testing x86-64
GPU: AMD RX480 / 4GB VRAM
CPU: Intel Core i7 4770 (3.40GHz) / 16GB RAM
OpenGL renderer string: Gallium 0.4 on AMD POLARIS10 (DRM 3.8.0 /
4.9.0-2-amd64, LLVM 3.9.1)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 17.1.0-devel
(git-af73acca2b)