Here's an interesting paragraph from the book " Building and tuning high performance Electronic Fuel Injection" by Ben Strader.
"At and engine speed of 7000 rpm, Most ECU's can obtain information from between 10 and 30 sensors, process the info, make a decision about what to do an actually carry out its command about 40 times before the engine travels through just one degree of crankshaft rotation ! At that engine speed, it takes about .0000238 second to travel through one degree of engine rotation. That is a true testament to the speed and precision of OEM and aftermarket ECU's "
Mind boggling !