Chip running hot on blink sketch

Oh, but I do have a power meter :) And no LED on pin 13, so the LED doesn't interfere with power measurement :)

• Holding reset: 8mA (Wroom32 devboard with CP21x serial)
  
• Espruino Wifi off & blink: 135mA (127mA over baseline)
  
• Espruino Wifi on & blink: 150mA (142mA over baseline)
  
  

142mA / 127mA is 11.8% difference, but that's probably not enough difference to get the temperature differences you reported...

After 8 minutes the ESP32 reports 38°C with 23°C ambient. What is your ambient temperature? Is it stable during the measurements?

• Micropython idle: 48mA (40mA over baseline)
  
• Micropython blink: 50mA (42mA over baseline)
  
  

Yepp, that's a significant difference! I guess python goes to sleep while Espruino on the ESP32 doesn't.

It's getting late to check arduino but if you don't have a power meter & upload the compiled sketch, I will try that tomorrow.