s j b wrote:
However, on further editing of the picture in LR the image is refreshed after EACH edit (ie. file reloads into LR taking a few seconds
Yes, that is so, and it is - as Victoria said - a consequence if you have <Automatically write changes into XMP> checked.
With that option checked, Lr writes each step that you do in the Develp Module into XMP (actually into the header of the file with a TIFF), and immediately reads it back. That causes the refresh.
Uncheck the box <Automatically write changes into XMP> and this refreshing will stop.
When your work on a batch of TIFFs is done, just select them all in the Grid View and press Ctrl / Cmd + S to save all the edits to "xmp".