If they haven't done much work / don't have anything checked out for editing, delete their local repository and let it recreate the next time they connect. May take a while, depending on how much material is in your Workarea.
If you DO have a large Workarea, try only synchronizing the areas you're actively working on (delete local for the other bits).
I have found that having a lot of the structure expanded and/or having the 'double tree' view open also slows things down to the point where it crashes on restart. I suggest getting into the habit of being in single tree view with everything collapsed when you exit - it seems to speed up starting up again.
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