Based on your observations, I installed several versions of PhotoLab 5 on macOS Monterey on MacBook Air 2020 (8CPU, 8GPU, 16MB RAM; Rosetta2 was used)
I then tested versions 5.1 and above and got the same export times, give or take a few seconds for an export of 60 images:
- 61 seconds → 21.4 MB/s with No Correction and without exporting metadata
- 191 seconds → 6.8 MB/s as above - plus DeepPRIME in its default settings
Please note, that if you change image customizing, export times can change considerably. Also, if the computer goes to sleep while exporting, export will be suspended and will only resume, when sleeping is over.
Notes
- edited out misspelled version numbers
- make a database backup, as DPL 5.1 and earlier cannot open DPL 5.2 database files:
No Fallback within the same version of DPL5!