Ran it on my desktop: 2:25
i5 6400 @ 2.70 GHz, 8 MB RAM
This and the earlier laptop result are on patch 13
Seems like the deciding factor is just pure CPU speed. Memory or Video card do not have any effect.
I concur. The video card definitely has no impact. I ran Task Manager during an AI turn and the NVIDIA card on my laptop stayed at 0%, while the integrated Intel UHD GPU only ran at 4%. CPU and memory utilization remained static at about 20% each. The CPU did turbo boost from 2.6 to 4.0+ GHz. The SSD stayed at 0%.
i7-9750 @ 2.60GHz, 32GB RAM
I haven't run the benchmark test, but on a huge Siwa planet with 6 majors and 43 minors, the AI turn is about 10 minutes.
Other games like WitP:AE, GG's WitE, WitW, all have long AI turns, so I just Alt Tab and do something else on the computer until the turn is done.