1.2 introduced the ability to run in true high resolution in the 3D view and have driver forced AA.
If, for example, you were running at 1280x1024 before 1.2, the 3D view was running in (roughly) 1024x768 with no hardware AA. If you are now still running at 1280x1024 your 3D view is also running at 1280x1024 which puts more strain on your system. On top of that any forced hardware AA is also applied (if you had/have it on)
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