Random() is much too slow

[ptillisch]

Hi @arduinomarc. There is a discussion on the subject, and explanation, here:

Random function on R4 terribly slow

A common use of Arduinos is electronic games. To test such games, it makes sense to replace user inputs by random data using the built-in random function. This works pretty well with Arduino UNO and Arduino MEGA2560. Surprisingly, the latter is 20 percent faster, which I don't fully understand, but it won't give me sleepless nights. When I switched the project to UNO R4 Minima or WiFi, at first it looked like I had bricked the MCU. Only after an endless wait some data was printed on the Serial …