We have been having some issues in the past week as we have been developing new features that are including more ajax based features and other additional improvements. This has caused some problems mainly when you edit a domain or when a domain is viewed within a few minutes of it being added to our system. I just made some modifications tonight, that have improved the time from 4-5 seconds which we were experiencing earlier today, to now it's about .2 seconds.
So hopefully that issue has been resolved.
Donny