Flight Sim FS9 -10 memory allocation

I have a 3 -4yr old shuttle with 2.4g single Processor, max'ed 2g older DDR RAM, APG Radeon 1600Pro 512 /128 vid card .  FltSim works good, actually surprisingly well altho nothing else is on the computer.  Just FS9 & FSX, TeamSpeak, FSHost., a few other small apps.....and of course virus protection stuff.  FS9 holds a solid 24 FPS with almost all sliders at max,  which is fine.  FSX is another story.

Anybody out there have any suggestions on the possibility of getting a few extra Frames out of the game using a Memory enhancer or equiv ?  I run a  registry cleaner I like......a couple of times a night usually.

prefer replys to greg312@cox.net