It's a good deal faster than XI when things trigger properly. In fact, the global's feel faster than WoW depending on what you're doing. Spirit dart spamming for example readies in less than 1.5 seconds. Problem with the servers is, you spend a good amount of time waiting for the ability to 'ready' so it seems like it takes forever. But if it readied/cast/recharged like it was supposed to, it would be a good pace.
The only problem I have with the combat is the cure targeting. Fighting something and casting cure, had to cycle through enemies and didn't find any way to quickly go between myself/party members. Maybe casting on an enemy defaults to yourself? I dunno, but it seemed clunky and could use work. Everything else seemed fine outside server issues.
XI Wiki


