Delta is right, it doesn't affect the performance of your laptop at all. However, there is another option where you wouldn't need to buy another monitor. I use a Kensington docking station and I love it. Makes packing up and leaving simple and yet gives me the desktop feel when I'm at home. K33239 is the model number.
Haha, I'll defer to you - I'm a computer engineer, but I only have 5 years experience Unless you count life, then I've got 24