ESP8266 Vs. Arduino Uno
Head to head comparison of a WeMos D1 (ESP8266) versus and Arduino Uno (ATMega328P). Which one is faster? We run two tests. The first is simply turning the built in LED on and off as fast as possible. The second is computing Pi to 250,000 digits.
via YouTube https://youtu.be/oAcABzCtfGA