Well, this came from AIG, so I presume they know what they are talking about.
Using LittleNavMap, I can see the groundspeed of the AI aircraft cruising in the flight levels. They seem really low, and it’s not because of winds aloft. Speeds around 200-250 kts for every commercial jet aircraft. Should be 400-550 kts depending on the winds. For example, my current ground speed in the CJ4 is 474 kts at FL430, and the Delta 757 following behind me is 205 kts at FL410. A 757 should be closer to 500 kts. There’s something wrong with these cruise speeds.
This was the first time I noticed it. And it wasn’t just that one 757, it was all the commercial aircraft as far as I could tell (per LNM). Later in the flight I blew past a Southwest 737 that was showing 211 kts groundspeed. I would believe it based on how fast I passed it (260 kt closure).
Yeah, when I do another flight, I’ll see if the issue repeats.
And their response:
I think there could be some kind of a “shift” between the numbers and what happens in the game. We have the same thing for take offs where the realistic speed value is being reached and you can see a very short take off roll.
The same thing could apply to cruise speed. Maybe we need to put something extra on top of realistic speeds in order to generate the right visual effect.
As mentioned above, you can get more info from their forum or discord!