I'm opening a form from a main form in my dbase, by means of a button. On the main form I have several buttons which open different forms. One button is to open my Trip form, but it takes about 10 seconds to open this form, while other forms are opened immediately after pushing the relevant button in the main form. Why would there be such a delay in opening that "Trip" form.

This could be due to a number of factors, such as the number of fields, data present, any macros you could have, all sort of stuff.
I wouldn't worry about it too much though, just try 'tweaking' a little.
Hope this helps.

You could try using the anylizer to offer suggestions on your forms speed.