That won't help.
Usually the problem is the CPU, and tbh theres not much that can, or imo should, be done.
The only way to make CPU load lighter (that i can see) is to go for Multi-Threading (which wont help in the case of a lowend system), 64-bit (wont help either) or to try to work out a way of calculating the physics with less calculations, which might help slightly, but what happens when the physics get better?
LFS is a modern game, you can't expect a PC from the ark to run it, as harsh as that is - a Skt. A system can max LFS, and yet good luck even getting Crysis or SupCom to give you more than 5 fps on low with it...