Mail extremely slow, sometimes cannot connect

Mail has become incredibly slow: sometimes it take thirty seconds to load a text message with two lines.
Sometimes, upon starting up, it can't connect at all.
At the same time, the internet connection is fine, and all browsers work.
I'm on 10.8.5 with a first gen retina MacBook Pro with 512 Gb disc and 16Gb ram.
Should I reinstall Mail? What could be the reason for the sluggish performance (it doesn't happen all the time, sometimes Mail seems to work fine, but very often I get "Loading..." forever.
And, again, I'm getting the zigzag sign for interrupted connection. Why doesn't Mail work?
update: I checked activity: Mail is constantly logging out of my mail accounts, and then has to log back in, which is why it's so slow. How can I prevent Mail from logging out?
Also: Mail gets stuck in the middle of downloading messages. The blue bar in the activity window only goes halfway, and then is stuck for fifteen to thirty seconds... which is the time it needs to get me my mail.

Sometimes this problem can be cured by tidying up the Keychain, where login info is stored. You can do this by opening Keychain Access in your Utilities folder. Find the location and login info for the mail account. Delete, say, all but the most recent one. Does that fix the problem?  If not, go back and delete even the recent one. When Mail asks you for your login stuff, give it, then check the box which says to store it in the keychain.  Sometimes just doing this last step is enough to clear up the annoying login windows.
charlie

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