since i was testing the game on Ubuntu 18.04,
with Ubuntu 18.04 the mesa, opensource AMD drivers, wine 3.10++ combo gives me ~15fps more than the older stuff in Ubuntu 16.04 on the same hardver.
btw gallium-nine didn't worked with SupCom. the game gave me this error "Unable to Create direct3d" no matter what i did. so i went back to the original drivers... but i kept Wine 3.18.
if someone wants to experiment with it, start here:
https://launchpad.net/~oibaf/+archive/u ... cs-drivers
https://launchpad.net/~commendsarnex/+a ... u/winedri3
"Gallium-nine lets you run DirectX 9 games in a faster way, avoiding the inefficient translation of D3D9 calls to OpenGL."