I am having a problem with SW 2012, when I rotate my assembly a small window appears on it, window inside which I see my assembly doing the rotation I was doing. However, in the main window, the assembly is blocked.
Attached is a screenshot with the little party in question.
Despite good computers, I sometimes have this problem. I had solved it with the update of the drivers (I didn't check if they were SW certified though).
After that, you need the graphics card that is fine:)
1) By going to options => performance and adjusting the level of detail but which makes the reconstruction slower
There is also in this option a button "go to image quality" => set the highest image resolution (personally I put it at the beginning of the red notch and check "optimize the length of the edges). This option has more impact than the level of detail.
But of course this slows down the reconstruction a little
2) by updating the graphics card driver.
For this Dassault has made available online updates that are good according to your graphics card and solidworks at the address below: