Ah ah ! You did well to redirect me to your link: before yesterday, in answering you, I did not see that you had already given your impressions: now, I will try to answer your questions:
extract from the "read me"
"...In the solo mode, you have access only to fighter planes: in the coop mode, you have access to the planes but also to two of the helicopters: in the conquest mode , you have, of course, access to all the vehicles: For a good balance, there are at disposal, 10 helicopters and 12 planes, which allows almost to about thirty players / bots...."
In fact, in the conquest mode, the spawn is done in a random manner: sometimes in a helicopter, sometimes, next to an airplane: this is due to the fact that, for a control point, the respawn locations are very distant One of the other: if I had known that one day the map would be hosted here, I would have modified this kind of detail; now, It's too late !
High-poly ? no; In general, it is rather the objects that eat GPU: but here, there is almost none: with my old i5760 and gpu amd radeon hd 5570, i have no FPS slowdown: maybe you lack memory, or too many bots, in solo or coop mode?
For the blackspots, It is an old problem, typical of 1024x4 maps: and never completely solved by the Bfeditor masters: the dynamic shadows are horrible: the only solution is to disable them in the video options:
the price to pay for so huge maps...
Did you try the map with bots ?
I ask, because there are rarely online players,......for the moment