This was to make sure nothing was cached in the program and also allow for the fan to slow down again. After each run I closed Sharpen AI, waiting for about a minute, and then restarted it. On each run I started Sharpen AI, opened the photo, set it to Zoom to Fit, and then hit the Update Preview button while timing with my phone. I didn't bother with the other choices because I have done it in the past and they are much slower. I ran it 3 times selecting Auto and 3 times selecting the MX250. I was just interested in the time to update the display while showing the whole photo. I didn't time saving it to file because then the time to do that is included and that can vary a lot depending on what kind of drive you are saving to, the speed of the drive, etc. Naturally, it is much slower than using 100% which only displays a portion of the photo. I set the size to Zoom to Fit because that would display the full image and would also take the longest to update the screen and give me more granularity for timing.I opened a 16mp photo using Auto for everything (model, settings).Then I started the standalone Sharpen AI with the processor set to Auto.I rebooted to clear everything out on the computer and then waited about 3 minutes after booting to give all the initialization time to finish. I set Auto Update Preview to off to make it easier to time and using my 1920x1200 monitor. Sharpen AI 4.0.2 has these choices on my laptop: My current laptop that I bought in 2019 has these specs:

In Preferences, Topaz added an Auto option in the AI Processor drop down menu in addition to the other choices that were there before and it is fastest on my laptop using that setting. I noticed something a few months ago concerning Topaz Sharpen AI, Denoise AI, and Gigapixel AI.

Topaz gigapixel ai 5.5