I don't know why it's only running slowly from one computer and not the others. But here are some general considerations (excuse me if this is not new to you).
-Are you avoiding Access functions in the query? Using Access functions (such as Iif() and what not) can force the query to take multiple trips and slow things down
-Have you tried a pass-through query? You won't be able to alter data in the typcial Access way through pass-through queries (they are read-only), but if you can do this for a report or some unbound form, this could significantly improve the speed of a query. This can be some hassle to set up, but I think it's worth it.
-Just to make sure, is there any change in how the file is accessed between computers? Do some access the same file on a server, and one group run it locally on their own machines?
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