I bought GMod the other day and enjoyed it while in Windows Vista (Boot Camp) however it was a bit sluggish. I know from experience that source games tend to run nicer inside Crossover than actually in Windows, go figure. First off you’ll need to install crossover, and steam inside crossover, there are plenty of tutorials on how to do this. Next you’ll need to complete the font hack so you can see the text. In crossover go Programs, Run Command, select the correct bottle, and type in regedit. Inside regedit navigate to HKEY_CURRENT_USER – Software – Wine – AppDefaults – hl2.exe – Direct3D and double click on tf2_alpha_hack and replace it with “-game tf2; -game ep2; -game portal; -game garrysmod”. Now in steam you’ll have to right click on Gmod and click properties and change the launch parameters to “-console -heapsize 512000 -dxlevel 70 -novid +cl_drawmonitors 0 +r_shadowrendertotexture 00”. If your game launches and you can only see a quater of the window, just change the video settings, they just fit in.