Minty green tree colors can be caused my old shaders if you did an DCS update and not a clean/new install. Just delete the ...Users/xxx/Saved Games\DCS\fxo and ...Users/xxx/Saved Games\DCS\metashaders folders. The game will rebuild those shader folders for each Theater. So, then fly a quick mission in each theater and wait for it to load.. and wait... and wait.. Once they are built it will load faster.
If you are getting 100-150 fps you can turn your graphic settings up much higher. Try to match your refresh rate of your monitor. My monitors are 60mhz.. So, I shoot for 60fps on average, and turn my graphics up until the fps are hitting around that range.
Cheers!