I noticed FlightGear runs slow on the following system (which it probably shouldn't):P4 2.2512MB DDR PC2100 RAM64MB VRAM GeForce 2 MX400According to the FAQ, this may be due to software rendering as opposed to hardware rendering. how do I set FlightGear to hardware rendering from software rendering? Thanks in advance.

What options/parameters are you starting Flightgear with? It's likely that changing one or two options will fix your problem.