Have you checked with your host provider to see if anything has changed?
If every thing was working fine and a week ago it started to go slow, something changed. If you didn't make any changes to Atahulapa, then it's something else.
Temporally switch to the default thems, still slow? then talk to our host provider.
It could be anything from spyware on your computer eating the cpu cycles up, a change in the bandwidth at your ISP or somethinbg at the HOST computer.
If getting else where on the internet is still fast, I'd start with the host. Check the access when you use what ever control panel they have.