Having trouble deciphering TPS lag on Forge 1.20.1 server

Hello,
Trying to run a self-hosted server for some friends. I've ran a couple of these before and I did a bunch of testing beforehand, but I'm still having some issues with TPS when players are joining the server. It falls behind and has trouble catching back up. I can't determine exactly what is causing the issue and am having trouble deciphering it from the spark report. Any help is appreciated and I can share any more if needed. Thank you!

Here are a couple spark profiler reports:
https://spark.lucko.me/HSt7f1dTdl
https://spark.lucko.me/OTRb7ccaYj
latest.log256.22KB
debug.log3.16MB
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