Slow expose features after attaching a external display

I've noticed that on my macbook if I attach a second screen (in my case a Samsung HDTV running 1360x768) all OS X expose features are really slow.
CPU is running only at 10% or so (constant minimum of 6).
Is that normal or should i start looking for a program that is slowing things down (quite newby for this so where to start).
Always doing something like copy files or so etc. i noticed that does slow stuff down... but question remains because when i detach and still am copying files it's not slow).

turn your refresh rate all the way up go to system prefs then dispplays then turn the refresh rate from there

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