How much physical memory do you have left?
Just do a Ctrl-Shift-Esc to open up Windows Task Manager and go to the Performance Tab. And look at Memory..
I really don't know if adding more Ram would help, But it would Speed it up From Sleep and boot, So you might see a performance increase..It could also be your network, Do other computers connect to your wireless network faster than your netbook?
Hope this Helps..