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TIL: MacBooks are slower when not plugged in!

Am benchmarking something either storage- or CPU-bound (still not sure), and seeing the benchmarks take about 50% longer when I unplug

You can check this for yourself with some simple CPU-bound thing, like

```$ time python -c 'x = 0
for i in range(0, 100000000): x += 1'```

They must use some tricks to get a 18 hours long battery life :sweat_smile:

This one is also important to keep in mind when measuring storage on Macbooks: <https://twitter.com/marcan42/status/1494213862970707969> ... without flushing to stable data loss is possible.

Weird that POSIX is not more emphatic about this

reminds me of mongodb achieving amazing transaction throughput by buffering writes and not fsyncing them

and hiding all this behind the “write concern” concept