Performance

Here's a sample little tight counter loop, running for 10 seconds on 3 different setups:

MicroPython on Teensy 3.1: (96Mhz ARM)

endTime = pyb.millis() + 10000  
count = 0  
while pyb.millis() < endTime:  
    count += 1  
print("Count: ", count)  

Count: 396,505

---

C++ on Teensy 3.1: (96Mhz ARM)

#include <Arduino.h>  
void setup() {  
    Serial1.begin(115200);  
    uint32_t endTime = millis() + 10000;  
    uint32_t count = 0;  
    while (millis() < endTime)  
        count++;  
    Serial1.print("Count: ");  
    Serial1.println(count);  
}  
void loop() {  
}  

Count: 95,835,923

---

C++ on Arduino Pro Mini: (16 MHz Atmega328)

#include <Arduino.h>  
void setup() {  
    Serial.begin(115200);  
    uint32_t endTime = millis() + 10000;  
    uint32_t count = 0;  
    while (millis() < endTime)  
        count++;  
    Serial.print("Count: ");  
    Serial.println(count);  
}  
void loop() {  
}  

Count: 4,970,227