Need help from mac users (experts)

I recently bought a Mac and i have tried to install the game crossfire on it and play. everything turned out pretty good but there is 1 problem... when i join a game, the game just goes from High Definition Graphic to like the worst graphic you could ever imagine.. blurry text/font, the screen does not fit, tried to readjust the resolution and everything... doesn't work out so well, so if you've experienced this issue before, help a brother out please? thanks.

EDIT: i forgot to mention that i am using parallel.

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