help with optimizing/leakings? forge 1.20.1

i am working on a modpack for a small group of lovely friends, and am having some struggles with optimizing. learning java things doesn't come naturally to me (i'm trying!), so i'm hoping for advice, any help is really appreciated

not sure what info to start with, so here is a '/spark profiler stop' link
https://spark.lucko.me/e15ZPV0Eu5

(pls be gentle, i am a little self conscious about being a novice compared to the huge skillz energy in this server)
spark is a performance profiler for Minecraft clients, servers, and proxies.
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