It took AI Sharpen more than 7 minutes to save a tif file back to my ssd on my MacBook Pro. 7 minutes and about 8 seconds. The MBP is a 2018, 15" with a 6 core i9 chip, so it is not noticeably slow, but the save time for an uncompressed tif is ridiculously long and much too long to fit into a normal workflow.
I will check with compressed tifs and jpgs, but AI Sharpen needs to be speeded up somehow. I have thread indicators on my machine and I did not see multiple threads active during the save processing or, for that matter, during the sharpening.