When we scan things with the dialog visible, it only takes a few seconds for it to load after the scanning is done. When we have the dialog turned off however, the time for it to load is 10-15 seconds. Is there anything we can do to help with this?
I suspect it is some oddness with your scanner driver/interface, but you could try stepping through the ImageEn source to see if there is anything wrong there.
The actual Twain parameters could be different when VisibleDialog is true or false (ie DPI, color depth, etc...) using some devices. In my tests both settings (true and false on VisibleDialog) have the same result in terms of image and timings.