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One detail that I'd be interested to see are startup times for the MicroPython environment. Having compiled both Lua and Duktape (an embedded friendly ES7 runtime) for a Macintosh Classic, morally a Plus, I regularly got startup times of up to a minute - I think most of it due to the sheer size of the resulting binaries and standard libraries.

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It's obviously not directly comparable - each port will be different - but startup time is <50ms on an RP2040 (Cortex M0 @133MHz):

https://github.com/micropython/micropython/issues/8420

That's a useful comparison since it gives some insight to some important differences: part of the difference might be an order of magnitude increase in clock speed (say from 15 MHz to 133+ MHz); another might be an increase in I/O speed. A final one might be memory pressure - classic Mac OS applications conservatively specified memory to reserve in advance since they shared the same memory space, and a lot of purging/reloading of nonessential relocatable resources might be happening.

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