Monitor = slow performance

Hey everyone, I own a 2.5 GHz Intel Core 2 Duo, 2GB DDR2 SDRAM, 17" Macbook Pro (08) running Leopard v10.5.8
I recently purchased a 23" Samsung SyncMaster B2330 LCD monitor. Which I have connected to my Macbook Pro via DVI/HDMI cable.
I'm not sure why, but it seems that my computer is running fairly slower! A performance rate that is very noticeable in the work I do. Even small things such as browsing the internet I notice a huge difference. Now when I plugged in the monitor the only settings that were changed was obviously the Screen Resolution which changed to 1920x1080 instead of the old 1600x1200. I did not install any drivers for the Samsung monitor, I don't really think there is a need to.
Before this monitor I had a 19" or 20" Acer LCD monitor which was connected via VGA and I had no problems with performance with that monitor, everything was the same. Is it maybe because the screen resolution is higher that the performance is going down? I mean it's only a 23" monitor, not a huge flat panel 70" TV display!
Can someone please explain to me what is going on, or maybe guide me in the right steps of fixing this issue or even providing information as to what I may be doing wrong.
Thanks! Very much appreciated!
~ Carson S.

This document may be helpful:
http://docs.info.apple.com/article.html?artnum=58543
To quote:
"Certain external monitors and LCD displays: Certain displays may emit harmonic interference, especially in the 2.4GHz band between channels 11 and 14. This interference may be at its worst if you have a portable computer with the lid closed and an external monitor connected to it. Try changing your access point to use 5 Ghz or a lower 2.4 GHz channel."
In other words some monitors just do that.

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