[James_K]

> For what it's worth, a response time of 100ms is perceived as instantaneous

That's not true. From the source you cited:

> Increasing latency above 13 ms has an increasingly negative impact on human performance for a given task. While imperceptible at first, added latency continues to degrade a human’s processing ability until approaching 75 to 100 ms. Here we become very conscious that input has become too slow

The 100ms figure was in regard to conversational interactions with a computer.