External Monitor (Dell u2711) problems

Hi all,
I'm an editor and just bought a Dell u2711 to hook up to my MacBook Pro (2.53 GHz, 4GB Ram, NVIDIA GeForce 9400M). The DVI would only support up to 1920x1280 so I bought a mini DisplayPort to DisplayPort adapter and that got me up to my full resolution for the monitor.
HOWEVER... my computer seems to be too slow or the graphics card isn't good enough to support such a monitor. Is this true? When I use the external monitor as extra desk space and put all my FCP windows in it I get this banding on my subjects when they move. It just looks like very slight glitches and the movement isn't displayed so smoothly. I'm working with 1080p ProRes 422.
When I try and use the Dell u2711 as an external video monitor (display all frames) it lags pretty bad and the motion is stuttery and not showing in smooth motion.
Please help. Would I have been better off with the 27" Cinema display? I thought they were pretty similar monitors. Is my laptop or graphics card not up to the task? Just last Nov. or so I got this laptop with what I thought was the best available graphics card Apple had at the time for this laptop.

Go to your Audio / Video Settings >> A/V Devices tab and turn of "Mirror on desktop" for Playback ... this will reduce the load on your system as it will not be trying to decode the video for two separate (and different) playback streams simultaneously ie when using Digital Cinema Desktop Preview to display All Frames then you will not see playback in the Canvas window as well, just on the external preview monitor.
And/Or you could also try setting FCP's System Preferences >> Playback Control >> Gamma Correction to "Approximate" ... according to the manual this can offer a little performance boost (but to be honest I haven't ever tested this).
Choosing Real-Time Playback Gamma Correction Options
Whenever you watch your video on a computer display (such as video displayed in the Canvas, the Viewer, or via Digital Cinema Desktop Preview), Final Cut Pro applies gamma correction to the video to more closely approximate the way it would appear on a video monitor.
Note: Gamma correction is not applied to external video outputs such as DV or third-party interfaces because this correction is inherently applied by external video monitors.
If your computer’s graphics card supports gamma correction, Final Cut Pro automatically uses the card for accurate gamma correction. If your computer has an older graphics card that does not support gamma correction, you have two gamma correction options in the Playback Control tab of the System Settings window.
Accurate: High-quality gamma correction. This option is the most accurate but also requires the most processing power.
Approximate: Lower-quality gamma correction. This option leaves more processing power available for real-time effects but results in less accurate color and brightness rendition.
Tip: If your real-time performance is limited, try changing the gamma correction setting to Approximate (if available).
Hope it helps
Andy

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