It didn’t fare so well this time, with the framerate dipping down to about 27 fps and ranging as high as 50 fps. To see how far I could push Portal 2, I changed all the graphics settings to “High” with 2xMSAA and ran through the intro again. Without the Fraps overlay enabled, I’m not sure I would’ve even noticed the dip. This didn’t cause any sensation of lag or stuttering. To test a scene with a little more going on, I loaded the game’s introduction, which involves quite a bit of environmental destruction, and saw the framerate drop a couple times down to about 52 fps before immediately bouncing back up to 59-60 fps. With VSync triple buffering enabled, Portal 2 maintained a stable framerate of 59 fps almost the entire time I played it across a number of official and community-created test chambers.
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