PSA: avoid Crucial P1 SSDs. Write performance tanks after a few seconds of sustained random writes, and long-tail latencies are absolutely horrendous (>1 second). They drop to <5000 IOPS or worse, and sometimes stall. Seems QLC isn't anywhere near ready for prime time.
-
Did you use a reproducible test? I have a QLC Samsung 2TB 860 QVO be interesting to compare.
Just fio doing 4k writes. Ideally test it both with an empty drive and a full one (random data over entire drive). On the Crucial one though, you don't even need to do that, it happens on a fresh drive too.