Hey, Phenix , I will say it....... Do not buy a PC!
I dunno why they don't tell us... as far as I can tell, the "Quality & performance" slider is an attempt by the *application* to improve on the deficiencies of the machine... We don't need it!
Here's the secret and hold on to your seat:
1. Set the slider to Slow... Yes, to SLOW!!
2. Click on the button Hardware Options, it open a new small window:
3. Change the Antialiasing to 8x (if your action becomes jerky, come back and reduce it to 4x)
Now.. when you hit the Apply button, things will happen, don't get scared:
a) your application window will move to the top left corner of your monitor for a moment, then it'll go back to where it was
b) your application window will go white, psychedelic! for a moment, then...
WOW!! amazing Mac graphics power!
Also,
4. Check Anisotropic filtering,
5. Check Enable VBO,
6. Slide Texture memory to 256 (if it's not there already,)
7. Leave Fog distance ratio at 4.0.
Click OK, that closes the Hardware setting window.
Click Apply ,and then OK, that closes the Preferences window.
Try it out... if the action becones jerky... then go back in and
a) Uncheck the Anisotropic filtering, and/or
b) Reduce the Antialiasing to 8x or 4x
Also, in the Preferences window, play with the draw Distance slider... (higher settings increase jerkiness)
There! Enjoy your Mac graphics power !!