Does a laptop's GPU matter?

I have a 2009 13 inch MacBook Pro with the 9400M GPU (but with 4GB RAM and a Seagate Momentus XT HDD) and it seems to run a bit slower when connected to the 27 inch display, as in things lag a bit like when opening the Dashboard or entering Time Machine. Is this because the GPU has to work harder to power the display?
Forgetting about other specs, would a laptop with a discrete graphics card, like the recent 15 inch MBP, perform better than one with shared graphics when connected to the display?
Thanks in advance!

Difficult to imagine GPU itself slowing down whole system, but shared memory like with 9400M could slow down things while regenerating huge display like 27''.

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Fangzhou CHEN
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Hello and thanks for responding.
<quote>
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<quote>
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<quote>
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