[Microbit-Python] Slowness as integers move beyond 256

[M.-A. Lemburg]

[Sorry, hit send to early]

I've been playing with MicroPython a bit and noticed a strange
behavior: integer math gets rather slow when reaching numbers
above 256.

Run the attached script as example. It produces a wave on the
LED display and runs quite nicely until the offset reaches 251.
Performance then drops to about half the speed.

Is this known behavior and expected ?

I also noticed that the script stops when the offset reaches 500
with a MemoryError, even though the data structure for the LEDs
is modified in place, so perhaps it's not the math that's slowing
things down, but instead some memory leak.

-- 
Marc-Andre Lemburg
eGenix.com

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