Help! Server Lagg with 30people! Hosted on i9 with 64gb ram! DONT KNOW WHAT TO DO

Hello Guys!
Im new to this forum but i thought this was the place to ask it

My public Minecraft server seems to lagg a lot when we hit the 30 player mark.
for that reason i upgraded my hosting to a i9-10850K with 64gigs of DDR4 ram and NVME M.2 storage so hardware wouldn’t be a issue. i have 20gigs assigned to the server that is lagging.

I’ve tried many things but me and my team just cant figure this out, i thought i’d see if there are some smart people out here that could help me.
Timings: https://timings.aikar.co/?id=b3f7228fb1fa42a4a2af2438e913b91c
Also a picture of my hardware usage is included, i wish minecraft supported multicore hosting, is someone knows how i could devide the usage over multiple cores please tell me.

Greetings, Wietse, Staff-Team and the whole community of my server
(idk if im allowed to post a name or ip)

What Java Version are you using?

Response to “java -version” :

“openjdk version “1.8.0_265”
OpenJDK Runtime Environment (build 1.8.0_265-8u265-b01-0ubuntu2~18.04-b01)
OpenJDK 64-Bit Server VM (build 25.265-b01, mixed mode)”

Using AdoptOpenJDK 11 should make a difference in the performance.

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