Video Enhance AI becomes slower with each update

Lets take 1000 frames video clip, GTX 1070 (drivers updated today), Ryzen 7, 32 Gb of RAM and Windows 10 (fresh reinstall with formatting HDD yesterday). Now we can process it in several versions of Video Enhance AI with absolutely same settings and calculate time needed to process each frame (it will be more accurate then processing tooltip).
Here are my numbers using Artemis HQ v11:
2.1.1 - 0.91 s
2.2 - 0.77 s
2.3 - 0.97 s
2.4 - 1.21 s
2.6.1 - 1.38 s
2.6.2 - 1.52 s
Is it supposed to be so? May be I need to find somewhere version 1.6 or 1.7 and it will work 10 times faster then 2.6.2?

what the video resolution and scale.Also 1070 user too and i have compare version 1.7.1 and 2.6.2.
i can tell that fot gaia model.2.6.2 is 33% faster then 1.7.1

My source is 1440x810, scale 200%, grain amount 1.3, grain size 1.5, output h264, constant rate factor 17. Reduce machine load in preferences disabled.