I haven't had any problems with it or heard of anyone else having problems so far. Are you positive it's not your ISP or anything?
There have been reports of this before too...http://forum.grasscity.com/general-feedback/773509-gc-running-slow.html I have had GC run very slowly for me sometimes too...usually fixed with a restart or re-setting my modem and routers...but not always... Haven't had any problems for quite awhile personally...
I checked and tested, its the server. Mostly likely heavy bandwidth on server is slowing down retrieval of page. Today happened the most, and at time it times out. Just thought I mention it as an FYI for the admin.
A lot of active users could be the cause of that, usually you wait for around 5 mins, clear the cache and restart your modem.