Ok so since the most recent patch on PBE, the performance on Mac has significantly decreased with the X1600.
I was getting over 50fps and amazing performance, and now struggle to get 30fp, and when laning the sound glitches and freezes constantly and the frame rate drops significantly.
I'm using the X1600 gfx card and it was recently fixed on PBE, but now it's suffering again.
Please change it back to however you had it. It was working great!!!!
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