I am including some screenshots showing the before and after with some pointers added into the images.
In DFFS I have a field ‘PO Details’ that I check for a value. Then I have another field ‘Number of PO Line Items’ that is used in conjunction with the first field to determine which fields should be shown.
A few other notes. In Firefox is does load faster than IE 9 but the difference is maybe 25% faster.