I encounter many problems when trying to load a number of pages/forms in sequence. Very often my script gets interrupted because Mech tries to do something on a page that is not loaded. I have tried inserting extra wait_while_busy without any success. Inserting extra sleeps does help but slows it all down substantially. Really this is something that urgently need improvement in my opinion. It would also be great if the script does not interrupt when an error like this occurs but rather just moves on to the next task.