Running Python on Microcontrollers With Zero Boot Time

webandcrafts

When Python starts faster than you can blink, you stop asking why and start asking how far can this go.

Microcontrollers used to scoff at anything heavier than C. Python? That was the slow, chunky giant you kept at arm’s length when you were trying to shave microseconds off power-on routines. But that’s no longer the case. Something has changed. Fast.

We’re talking Python booting in sub-millisecond times on embedded devices — no more sluggish startup, no more excuses. Just raw power and instant execution, even on the smallest chips in your IoT drawer. You tap the power, and your script’s already running.

So What Changed?

Two things, really.

First, Python’s gotten smarter — stripped-down variants like MicroPython and CircuitPython are rewriting the rulebook.

Second, there’s a new generation of microcontrollers that don’t need a coffee break before they boot up. The synergy between the two? It’s magic.

Let’s take a quick peek under the hood:

Yep, Python is nearly on par with native C++ in boot speed…