Hi Meateater,
I stopped the previous game I was playing as it just got too slow but restarted playing without America and canada and it worked fine, no more than a minute or so between turns.
I haven't finished that game as I was finally winning the war against russia and with over 1300 units (mostly panthers) there was little resistance left. Another couple of nights or so and I would have won but the fun had gaone out of the game so I decided to try a new game, this time as Japan. More on this later.
Some comments on the last game: I didn't build many tigers, they have quite a high cost for only a 4 point increase in attack and combined with the loss of 1 move didn't perform as well as the panthers. Now you've reduced the movement to 2 though for the other tanks this could change.
I still think the cost of UBoats is too high, with the AIs ability to 'see' all units (even if its supposed to be programmed to ignore them), the AI found my UBoats with too great a degree of repeatability to be accidental and there life span was very short (1 or 2 turns max). I built mostly battleships instead.
I liked the resource requirement for the tigers / panthers but maybe you could take this another step and have 1 resource for panthers (ie In Greece) and the other further away (Edge of Russia maybe?) for Tigers. Just to give increased reason to attack Russia.
Italy didn't stay allied to me for long before sneak attacking me resulting in me placing their cities in 'protective custody'. England had pretty much cleared them out of Africa by then anyway. Hopefully Conquest will prevent this in the future anyway.
England itself fell quickly, but the cities in Africa / India provided me with plenty of problems early on.
I made a mistake trying out the parachute plane, loading it with 5 paras and then trying to airdrop them next to an English city, the plane was shot down and I lost the lot! Opps, next time I'll use more planes with fewer people in it
Ah well, back to work I guess...