I am having very annoying microstutter and choppy navigation regardless of frame rates of more than 100 at 1920x1080p with GTX480x2. Stuttering happens with the SLI on or off. There is no problem with the other Source engine games. Those are running well without any problem. There is only Portal 2 that is needed to turn off the SLI. Gamepad support is inadequate than additional Source engine games and that is permitting me two axis only and that does not hold up gamepad buttons.
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