I ran into a similar problem a while ago, there seems to be a problem with the REFRESH(), maybe some sort of stack not getting cleared, I'm not sure. Solved the problem by putting a custom REFRESH method on the form which spun through the control array to do the refresh, large speed increase! Try something like that and see if it helps.

Bob

>>Did the same thing happen when all the forms and classes were readonly ? I could imagine that it would slow down performance if it was not because there is a lot of overhead opening tables (after all, forms and classlibraries are tables) in shared mode.
>
>I never tried that. All the forms and classes were stored on local [unshared] drives. The forms were not opened more than once at any given time. I was able to duplicate this on my own computer. The degradation was gradual. The more times you opened and closed a form the longer it took the next time you opened the same form.