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I want to fully switch to Ubuntu from Windows, the only thing currently holding me back is Starcraft 2: HotS that is not working well.

I get 25-40 FPS on all low settings (~150 fps on Windows with all low, middle shader). I'm using Ubuntu 13.04 (64 bit) with wine 1.6.

My system's specs are: CPU: AMD Phenim II x4 955 black edition Graphics: ATI Saphhire Radeon HD 5770 Vapor X Ram: 8GB Game is running from a SSD.

I'm using the AMD proprietary drivers and have made the recommended registry entries.

The strange thing is that while playing, the game has 0% GPU usage and the game uses only ~30% of one CPU-core, while ~50% of all cores is available. I also monitored the CPU clock while playing (with: cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq) and it keeps changing from 800MHz to 3,2GHz.

Any ideas how I could improve the CPU/GPU usage?

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