Thanks Baders. I've followed the tips and tweaks and while over all my rig (AMD 2400+, 512mb mem, MX300 sound card and GEforce2 GTS 64mb) I know my failure point (for Targetware) is the GFX card.
I'm sure that a much better GFX card would do wonders for me in acheiving higher FPS but I'll be completely honest in that I do not understand why that would be. While the aircraft are nicely detailed the rest of the graphics I've seen is just so-so at best. IMO the graphics are quite dated looking in comparison to AH, WB III, WWIIO or even FA. All of those perform wonderfully on this system.
So while I'm excited that T:Rabaul, Flanders and Korea have "realism" features I've onbly wished and dreamed of untill I get a better GFX card or T:W gets a major GFX optimisation fix (get the CPU to handle more of the load, and not the GFX card if that's possible) I'll have to just keep an eye on it's progress from afar.