How do I fix my Laptops performance?

Okay so I bought an RCA 32"tv a few months ago hoping to use it as a monitor for my laptop. After a few weeks of having the laptop connected to the tv via HDMI the laptop became quite slow and laggy. It lags all the time now, when I'm browsing the web or ingame. Anyway, so I bought Guild Wars 2 when it was released and all excited to play it I launched it and soon found that I was getting 10-25 fps. It was extremely annoying and unplayable. I first updated my drivers to the 304.79 beta drivers and still was having terrible performance issues. Next, my dad suggested cleaning the registry so I did that and launched the game. For some reason I was now getting 55-60 fps with great detail ingame. The whole computer actually ran much, much better than it had before. I was so happy and thought we had fixed it. The next day I connected the laptop to my tv again and that proved to be a grave mistake. The computer was back to it's terrible performance and all around general lag no matter what I was doing. I have ran the registry cleaner multiple times, I've ran malwarebytes and Spybot S&D, I've reinstalled the 304.79 drivers and still nothing is working. I can't even play GW2 because the lag is so unplayable. What can I do to fix it? My dad and I are all out of ideas since we've tried just about everything we can think of. Also, how can connecting your laptop to a tv damage it this bad? Or is that not the problem? Anyway, ANY help is appreciated. Please and Thanks in advance.

Dell XPS L502x
Intel Core i5 2410M 2.30 GHz
Nvidia GeForce 525M
6 GB Ram
Windows 7 64-bit

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Ahh, the GeForce 525m
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Well it's good enough to give me 60fps..

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(NT) Which is the rate of an LCD so you're done.
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You're not making much sense.. at all.

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Let's talk a little about why we are done.

99.9999% of LCD displays are running at a 60Hz panel rate. So if you get your FPS up to 60FPS then you have enough frames to keep up with the LCD panel rate. Any more and those are wasted GPU and CPU cycles.

Hope that clears this up for you.

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So I can't use it with the tv yeah but it should still work normally when not connected.

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And back to the top.

It's only a 525m and then we have other areas such as HDD speed and not much else. If the unit lags when restored to the factory, the machine is what it is.

This area seems to confuse those that were on desktops where we could swap out the video card and other parts to boost the machine. Look at your laptop. No card, no easy CPU upgrades. Maybe it's the wrong machine for you?

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