Hehe, 1000 wacom is enough, and the delay is very small. The key is that your computer is antique, with 256 memory, at least 5 years. Buy a new computer directly. If you have a desktop computer, a 3000 monitor is good. Now, all centralized monitors support high definition. If you have about 3500 stand-alone monitors. I can't help it. You have to change this. The transmission processing of the sketchpad should be fast to avoid delay or disconnection.

You can buy a good stand-alone notebook around 4000, such as ASUS K42 HD6570 graphics card.