I've created several sets of AI locomotives which I've taken to calling Zombies. I've also run several tests to see if there were any effects on frame rates. I used identical consists in which the lead engine was a player drivable version and the others were Zombies. And, I have compared them to consists where all were playable drivable. I have started with the same view in the same place and then have run them the same distance rotating the view(s) and noting the changes.Noted some oddities but nothing definitive. For example, on a consist of three U-Boats, I get a starting frame rate of 47 fps, release the brakes, no movement or other change, and the rate drops to 38 fps. Move the units and the frame rate stays the same. Difference between the two consists? The Zombie consists are consistently 1, that's O-N-E, fps lower. Swing the view so that other objects need to be drawn and of course the rate drops radically down into the 28's. This is certainly not a "lab grade" test or a academic paper presentation. Just that what I've seen so far leads me to determine that Zombies don't necessarily have any measurable effect on FPS.
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