Laptops

I run Doom 3 on my laptop, which is fairly new and high end.... though I meet the specs and then some, when I select for Doom3 to automatically select the best performace for my computer it will select low or the lowerst one, yet I dont understand why... and when i try to manually adjust the setting and then play the game is just slow and even slower when there are other moving character on my screen....

My Laptop-
P4 3.06GHz
512Mb Ram 2Dimms
80GB HD
64MB GeForce FX Go5200

If some super smart laptop/computer person out there or anyone out there with a similar hardware set-up and has smooth gameplay, that can suggets anything that would be great.
Thanks
-Mania

Go to this thread:

http://www.doomworld.com/vb/showthread.php?s=&threadid=26321

There are some great ideas for getting your laptop to run Doom 3 efficiently.