I remember those days when I hated laptop because I hated keyboards and mouse system on Laptop! But today, I realize that I was wrong!
As a part of proving myself to be true right now, I took a yet another test from laptop (I took one previously from my desktop machine and results are here) and guess what, I could get the same typing speed (rather somewhat more! 
) that is ~80 WPM !!.
A picture is worth thousand words!
If you want to try, go ahead,
http://www.typequick.com/ttest/start.asp
Stay tuned.. 