[AccessD] 97 to 2007 Performance issue

Dear all,

I need your advice re performance issue.

I recently migrated an Access 1997 application to Access 2007.
It has not been possible to put the app in production at the moment.

My customer put it in production the last days, and he reports a heavy
reduction in terms of reactivity.

Back end on a server, front end on user desktop.

Did you ever run into such problems?
What would be the possible causes?

I get to the customer tomorrow.

Thanks in advance for any help,

Philippe Pons