No onboard video chip is going to perform very well. However, there are things that can be done to help improve things, at the cost of eye candy. Before going there, have you made all attemts to insure as few background processes as possible?
The top half of the DXDIAG output would be helpful as well.
Heck, on my work computer it has an NVidia 7600GT card and I disable "Detailed Terrain" which makes for nice smooth gameplay, even when surrounded by 20 or 30 planes.
Yea i have turned all settings on both my card and in game to better performance and less detail,i get great Fr's when not near any planes (in WWI), better Fr's then in late war for that matter,but put me near 3 or more planes ,and i start getting bad lag.
I think the game is just evolving beyond what my poor little PC can Handel,if i had a job that would be my first big purchase,but i don't.
Hey! maybe you guys at HTC could have another contest thing like you did for the three monitor deal ,except make it a half decent PC.

But i do thank you for trying to help Skuzzy,i do enjoy this game and would hate to lose it.