Yahoo real slow

OK so my Yahoo email loading message slow. Recently i loaded the yahoo toolbar and switched to the new Yahoo from classic.
When i went to download an attachment it said it would take 4 minutes to download.
So i forwarded it to another Yahoo email and it down loads in seconds.
I went back to down load from original account after switching back to classic mail and still very slow download. The downloading and loading of pages on other sites is fine, just my Yahoo mail, i changed resoloution, cleaned cache, have latest Firefox went from classic to new back to classic
why would one Yahoo mail account work so slowly?
I would hate to have to forward all my mail to another mailbox to open it
anyone?

 

And what happens if you access this slow account with IE instead of Firefox?

This could narrow down to the cause maybe.