I ran a test, and after the test, Photoshop takes more than twice as long opening TIFFs.
And if I'm not wrong, the saving takes much longer, too.
The test:
Work on a RAW file in DPP, export to Photoshop CS3, finish it up, and import it into Lightroom for testing a few touch-ups (black slider adjustments, a few adjustments using the HSL panel).
First trouble:
When I saved and closed the file after it having been to Lightroom, Photoshop could not open it any more.
It started opening it, but got hung up when the "reading TIFF" blue bar was about 15% across.
Since then, Photoshop CS3 takes very long opening TIFFs.
Has anybody experienced something like this?