NESS Reloaded is an anticheat that aims to support lots of minecraft versions (from 1.8 to 1.17.1) without losing the advantage of having powerful checks
j.u.l. to SLF4J translation can seriously increase the cost of disabled logging statements (60 fold or 6000%) and measurably impact the performance of enabled log statements (20% overall increase)
Per the slf4j docs:
http://www.slf4j.org/legacy.html#jul-to-slf4j