Anime civil, not a very useful answer to the question. If you're not going to help, don't bother posting. Not everyone has the cash to constantly upgrade and besides which he said the sample game ran ok.
lostsoul1, there are several things you can do to reduce lag:
General things:
1. Reduce the games resolution. It says how to in the pdf manual.
2. Reduce the texture quality.
3. Turn off dynamic lighting.
4. Turn off the pixel shading.
Things specific to the game:
1. Don't have a load of enemies all bunched in one quite small area.
2. Don't have too many dynamic entities too close together.
3. Don't use too much by way of wide open spaces.
4. Ensure corriders and rooms are closed off.
5. Make sure you put a roof on enclosed areas.
7. Space out your level a bit more with long corriders etc.
Thats all I can think of at the moment, but take a look at the manual. There is a bunch of very useful tips on keeping performance high.
Hope some of this helps...
Glenn Carter