What is the reaction time of the Arduino interrupt?

arduinoaleman:
And when it comes to speed - 900 MHz vs 16 MHz is just like comparing a Ferrari with a bycicle.

I'm pretty sure that my bicycle can get a front wheel across the white line at the traffic lights before the Ferrari, and that's the speed that we're talking about here. Yes, the Ferrari might be 50m down the road before my back tyre crosses the line but the bike got there first.

A Ferrari is also much more difficult to get up onto the kerb and onto bike paths.