Lagging problem when connected to a Samsung Central Station 23"

Hi,
I bought myself a Macbook Air(Summer, 2011 Edition) about 3 months ago roughly,
and I also bought myself a Samsung Central Station 23" which works just as a thunderbolt or cinema display but much cheaper and much elegant.
It also sends audio signal as well as usb datas when connected to a pc or a mac.
Before buying this monitor, I searched for any history or experience regarding performance problem when hooked upto an external monitor the other users had,
and while some people say there are no such problems with new intel i core series which includes much advanced graphic core and much faster processor,
many people said they have experienced performance problems to some dregree as well.
Now that I seem to have this huge problem of lagging with my MBA when connected to Samsung Central Station,
I still have no idea why it is happening, nor how to fix the problem.
I use my Macbook Air connected to a Samsung Central Station 23" and it runs 1080P Full HD resoultion, which isn't that big deal to incur performance decline.
I shut my MBA screen when I use the external monitor, so there isn't much thing to interfere with the performance.
I don't know about other people who use an external monitor, but my central station monitor works on Full HD resolution only when i close my MBA screen or connect it as a dual screen. If the screen is left open, it runs with the same resolution as the macbook air.
when I start sensing decline in frame I always had my MBA open to lower the resolution which seemed to work fine again.
But these days,even when it's disconnected from the monitor it seems to have problem and the only way to bring it to the normal condition is to restart it.
when connected to the monitor It's even hard to open few tabs on Safari and play a web flash game.
It lags so hard I cannot even turn to other screen on mission control or swith to other browser tab without making it delay for a second.
I checked CPU and RAM resources when it started lagging, but almost 90% of the CPU resources was idle and more than 500MB of RAM was free.
After restarting the computer CPU remained the same, but more than 2G of RAM was now free.
Im guessing it has something to do with GPU performance but not sure how to fix the problem.
Do you think it's my Macbook Air's hardware problem or is it the monitor? or something else?

I have the same issue. Were you able to find a resolution for this issue?

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