In addition to the lead Allen offers to Tony's list, here are two causes I
ran into:

1) a network-based anti-virus program was updated and it "took offense"
at how Access accessed the back-end data.
2) a front-end form that loads ALL the related records will take longer
after you move the related records. If your form is designed this way (all
records), consider modifying it to pull only a single record at a time.

Good luck!

Regards

Jeff Boyce
Microsoft Access MVP

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"Afsaneh" wrote in message
news
I have splitted my database into 2 files . one containing tables which is
placed in a server and the other containig forms, reports and queries that
each client has a copy of it. the problem is opening forms takes time
although there are still few information enterd. what aspects should I
check
to diminish the delay?