Ok, so I started the game and attached perf to it by PID, waited a minute and
stopped perf with CTRL+C. Here it is:

perf report --stdio
    45.80%  Gothic2.exe     wined3d.dll.so          [.] wined3d_resource_map
    42.80%  Gothic2.exe     radeonsi_dri.so         [.] _mesa_unpack_depth_span
     4.82%  Gothic2.exe     wined3d.dll.so          [.] 0x000000000008c809
     0.94%  Gothic2.exe     wined3d.dll.so          [.] 0x00000000000f4a93

perf report --stdio --sort comm,dso
    55.15%  Gothic2.exe     wined3d.dll.so        
    42.91%  Gothic2.exe     radeonsi_dri.so       
     0.93%  Gothic2.exe     dsound.dll.so