I'd like to concur that saving the game seems to be the memleak. It's funny, actually.
1) I am worried that the game will crash (because of reports on the forums, and ATI business from before)
2) Therefore, I enable autosave every turn
3) Game becomes unplayable after about half an hour or so. I get frustrated and stop playing. 1.05 does not fix the issue.
4) Read about it on the forums. Turn autosave to every 5 turns. Get engrossed in a new game (for the first time, mind you) and play for 3 hours before slow-down, losing completely track of the time.
I would think that since people are worried about stability, they are increasing the frequency in which they save, making the game MORE AND MORE unstable, leading to additional frustration.
Win 7 x64
ATI Radeon HD 3400 Mobile (on 10.1 Catalyst, cannot update past it due to OEM restrictions).
Intel Core 2 Duo @ 2.24 GHz
4 GB RAM
I would also like to note that the second I destroyed an enemy Sov the game INSTANTLY started playing REALLY bad with the 3D models (something that doesn't always work that great but I know that is halfway just because of an older/weaker videocard). It may be trying to render old artifacts and then removing them, or something like that.
Another bug is when you ask Champion to marry you, the "Propose" icon remains in the Action toolbar until you "click-off" her. Clicking it does nothing (that I could tell). It's probably a similar bug as to the "build multiple building" bug where you can build as many of a particular building as you want as long as you don't deselect.
AI was a bit better, but tends to leave cities protected solely by champions, and OMFG ATTACKED ME WITH A DECENT ARMY (I think 10 units, including Sov). Sadly, I was able to defeat it with my smaller number (but somewhat superior) amount of units, but they almost got my Sov dead (with spells).
Haste and Quicken are rather OP with the current battle system... also, Teleport is >> I think that Kingdoms should be like Empires. Teleport/Blink is Level 3, and Imbue Champion is your free "starting" spell.
Though, yay for first good night with Elemental ~~~~