My first set of figures was just guessing from the work that I had done, so I decided to actually time both Sharpen and Gigapixel.
Sharpen, on a 20MP 16bit tiff, took about 3 1/2 minutes, so my “guess” of about 1 minute was pretty far off, and not in a good way. I tested it on the Gigapixel output and that took almost 5 minutes.
Gigapixel, on a 20MB 16 bit tiff, took just short of 6 minutes with the default settings and the upscale set to 2x. I assumed it might be faster on a smaller jpg I also timed it as well. a 16MP jpg from my wife’s Nikon point-and-shoot took a bit more than 4 1/2 minutes for the same 2x upscale. The first was done using Gigapixel as an external editor for PhotoLine and the second used Gigapixel as a stand-alone app.
Of course both of these are old. Gigapixel is the 2020 version, 5.1.7, and Sharpen is 2.1.8. Newer versions might be considerably faster and if your testing was using newer versions I could download the trials and see how they run.
The problem is mostly with Sharpen. I don’t generally enlarge photos, so the fact that Gigapixel takes “forever” to process my images on my machine is not a real issue for me. Sharpen, on the other hand, is something I would use more frequently if it did not take so long to process.
UPDATE:
I forgot to mention that the Sharpen AI setting was for Stabilize, not Sharpen or Focus.
I did some additional testing. For one thing I changed the setting from Enable discrete GPU ON to OFF, and the Stablize time decreased to 1:45. I then changed to Sharpen and the time decreased to 0:45. Still too long, but not 4 1/2 minutes.
UPDATE 2:
Well, OK. That is a big difference. Times for Focus, Motion and Softness were 0:31, 0:31 and 0:12. So the problem all along has been that the older Sharpen AI app was just too slow and they have improved that. I wonder if the same is true for Gigapixel. I guess I will give the trial a chance.
If you had not posted your times I probably would not have even thought about testing the trials, so thank you.