optimize

Hi, Alex

I test your 2.0 version for a 15*50 array. slowly... especially in firefox.

Maybe, you should give priority to optimization first.

Or maybe you should wait until FF is version 2.0

Or maybe you should stop messing around with stupid software and use a real man's browser :D

Seriously, would be great if someone send me an example where grid operation is very slow. I am obviously missing something. My current experience is that virtual mode actually makes things a lot faster. The only case where I still see a problem is large number of columns (>100).