I'm willing to bet that a 1.5-4.5 ms delay is absolutely perceptible. Anyone who is into gaming will absolutely notice any latency introduced in flat screen TVs versus CRT. Also, even though a movie is 29 fps, games that run at 60 fps second is absolutely perceptible. Even games that run at locked 60 fps that drop a single frame every couple milliseconds is perceptible to those who really have the feeling of a game down.

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Anyway, I honestly think that it's very impressive for William's to have been able to have the flippers "CPU Controlled" without introducing any lag. That's damn impressive for the 90s. Also interesting, I didn't know that AFMr and MMr are essentially emulated. Kinda cool, I guess.

That's the thing, I don't think a human can quantify "how much" it can be perceived, but only that it "feels" different.

If you spend any significant time on a game that drops a single frame every couple milliseconds (or has an unstable frame time), you'll start to notice--even if you can't quantify the difference.

I thought this thread was pretty cool. It's nice to see the OP use scientific method to demonstrably prove (or disprove) something one way or another. The nice thing about science is that it's ok to be wrong, as long as there's evidence to support the ancillary claim. No shame in being wrong.