Hey! What do you mean exactly? Animation speed? It's randomly changed during act so the animation does not look monotonous. I'm planning to add ability to change animation's speed manually in future update.
The length of the act depends on your Endurance attribute, so I guess you just have high value and it's not a bad thing. But yeah, maybe I should lower length of the act with high Endurance values. And no worries about Lover skill, you get it's exp during act, not after the act ends.
Also I have some plans to make the act more dynamic by adding new active skills.