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waow 50% less memory for a mimalloc -> jemalloc swap (yes that is under-3G-rss while backfilling)

i think my older hydrant benchmarks were either faulty or maybe because stuff changed but looks similar on hydrant full backfill

jemalloc-tuned being _RJEM_MALLOC_CONF=background_thread:true,dirty_decay_ms:1000,muzzy_decay_ms:0