I've been experiencing some slowing when I play solo campaign. I'm thinking perhaps it has something to do with me nearing the level 20 mark, the bots have more abilities like I do and the use of these abilities slows the game down somehow. Also when my bot team and I are close to about 3 or four other bots there is more slowing.

This was noticed before Saturday's update, so I will get back with whether or not it still happens after the update later today.