couple of things ive noticed and/or had issues with. Keep in mind im running a high end system.
Definite issues:
1. I have noticed that when joining groups/armies, there is a definite lag time, the larger the armies involved, especially if its made up of multi-unit cards, the longer the lag time, this also seems to be an issue when large armies are fighting, I've had a couple times where two large armies would meet and it would CTD, consistently, unless i move the view so that they arent on the screen anymore quickly.
2. I get a good amount of seemingly random CTD's
3. I got a "Out of Memory" crash on a medium mapabout 270 seasons into the game (keep in mind there were some random CTD's during that time period as well).
Highly recommended tweaks, almost buglike in nature.
1. The starting areas seem to be lumped together, i tested it on 5 maps, and in medium size maps, 4 of the 5 races were always lumped together in a fraction of the map, with the 5th not much further, id say the 4 of 5 were all in 1/15th of the whole map, with all 5 in 1/10th. IMO we need to be spread out semi evenly, or at least more so than we are.
2. erm thought i had another but dont recall 
I just started playing yesterday and started off with this exe, been playing on challenging and the AI seems to be decent.
thanks for releasing this for us to use froggy!