Okay one hour in.
The transistions between actions on Lamannia are a lot smoother than in live. For example on live if your character is running and jumps about 50% there is a noticible little hitch, I would say that transistion on Lammania is under 5% of the time now.
I have run into a number of invisible objects on Lamannia with my characters, usually in place where objects would be if the event they are there for a live. (The dude in the harbor who teleports you to Smuggler's Rest for example)
Mob Spawns appear to be faster and smoother, in part 1 of the Shroud the spawns from the portals just seemed to be a lot faster than on live. It's like once the server decides it starts teh process where we get little hints it is going to happen on live now.
I saw fewer attacks lost to the bit bucket. I saw a grand total of 2 missed attack (where you do the animiation and nothing happens) in the first hour. On live I swear it can be once per mob.
I didn't lose anywhere near the number of magic attacks with my spell caster as I normally do. Still a few went into the bit bucket but not one in four or five that I am used to.
A large number of textures must have been rerendered. Seams have moved on a number of armor clothing.