Yeah that's pretty crazy. I have a M1 MacBook Air 16GB/1TB purchased on launch day which was 13 weeks ago and I'm at:
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So for 90 days, that is about 65 GB/day. I think the 16 GB RAM makes a lot of difference.
One reason that the 8 GB M1 Macs seem fast is that they seem to preemptively write to swap before the virtual memory load actually requires it. Since they have 8 cores, they probably use one of the high efficiency cores to do this in the background. When a memory fault occurs, the SSD already has a copy and the needed memory can be allocated without concern. This would be perceived in a lot of cases as instantaneous if the system guessed correctly. All this is speculation but given the reports about excessive writes to the SSDs on 8 GB M1 Macs it seems likely that macOS is being too aggressive at times. With 16GBs I do not see this behavior.
Edit: Another interesting thing is that in 21 days, your power on time is much higher than mine with 90 days of use. Trust me when I say that I'm on this machine many multiple hours a day/7 days a week, so this can't be just a measure of time the computer is turned on. It must represent when the SSD is not in low power mode and is being read or written to.
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