My mail on iMac is not working properly. Click on email, it hangs, showing previous email. Takes forever to load. "No message selected" showing in a blank screen

My mail is not working properly: when I click on an email it hangs, frequently showing the previous email, often for up to a minute. Or it shows "loading" and just sits there showing nothing. OR there is a blank screen saying "no message selected". It's slow to load, and I'm not happy. Recently switched from Windows PC, not impressed so far. Very frustrating.
Any suggestions would be gratefully received. (I upgraded to Mountain LIon, and don't think I had problems before I did so, though I hadn't had the computer for long.)

Hi Sarah,
Open Console in Utilities & see if there are any clues or repeating messages when this happens.

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