As of the 6/30 update, the animation speed slows down during fights. It starts out the normal speed but at some point, gets slower.
For example, the active unit bounces up and down slower. Arrows fly through the air slower. Attacks made by both me and the computer take longer to illustrate. It happens independent of the size of the fight. It occurred when my 12 were up against 42 orcs fighting each other as well as against 8 bandits.
If it makes a difference, I downloaded the beta and played that before I got the update from today.