HELP: What can I do to reduce lag?

[Rapidwolve]

For some reason I lag more than almost everyone else on Graal.

Here are my computer specs:

Windows XP Service Pack 3
Intel Celeron @ 2.4ghz
512MB (256 x 2) RAM
NVIDIA GeForce 6200 OC (256MB RAM)
DirectX 9.0c

Is it because of my RAM/Processor speed that Graal lags or is it because of my graphics card? What F3 options would be best to help Graal? Would unchecking 'use a minimum of video resources' make Graal run faster or slower? Would running Graal in high priority mode make it faster?

Buying a new graphics card or computer is not an option because I don't have the money right now, so any help with a better configuration is greatly appreciated!