N.A.M.

N.A.M. cheat codes: 
NVAGOD - God mode
NVACALEB - God mode
NVASHOWMAP - Shows the whole map
NVABLOOD - Gives all weapons
NVUNLOCK - Toggles all locks
NVAMATT - Something w/ the Radio
NVDUKE - Not sure?
NVACLIP - Allows clipping
NVALEVEL### - ex. 205 Episode 2, Level 5
NVARATE - Changes the rate.
NVADEBUG - Debugs i guess.

Go in your NAM folder and open the NAM.cfg.
;ScreenMode
; - Chained - 0
; - Vesa 2.0 - 1
; - Screen Buffered - 2
; - Tseng optimized - 3
; - Paradise optimized - 4
; - S3 optimized - 5
; - RedBlue Stereo - 7
; - Crystal Eyes - 6

ScreenMode = 1

It's set to 1, try those other modes and find the fastest mode.
Now everyone should be able to run 600-800!!