I've got the same issue and it started with 3.0.1. There is something wrong with the install, I just don't know what.
It's taking 60 seconds to load any page public or admin.
- I deactivated all plugins and it didn't help.
- It's not a theme issue.
- I deleted all files and re-uploaded.
- I cleared my browser cache.
- I've cleared my cookies.
- I've run the upgrade script and it says there is nothing to upgrade.
- I force ran the upgrade script and it didn't help.
I think it's a database issue and am contacting my host. I don't think it's WordPress related anymore.