I have noticed when I try to select units that are in a city, if I hold down Control on the keyboard and try to select the units, this makes my mouse VERY laggy. It feels like it is trying to hold the cursor in the area I first clicked (The picture of the unit I want to eject from the city). I noticed it was like this in WoM as well. I know it is a small thing and probably not on the list of things to get fixed right away, but it sure if annoying. I keep checking my mouse for a cat hair blocking the laser 
- Dave