the forms that are configured for web utility that takes so much time in opening.What do you mean by *"for web utility"?* Is your Forms application web deployed?
I have change the browser IE6, and Mizilla Firefox and JInitiator to Java Run Time(JRE) but the behaviour is same.This statement suggests your application is web deployed, but I don't want to assume this is the case.
the forms that are configured for web utility that takes so much time in openingis a very unspecific description. As you might well be aware webutil contains a lot of functions. I don't suspect you use every single one of them in your form.