Performance issues on a modded server

Hey, I have 1.21.1 NeoForge server in a dedicated machine for my friend group and I'm having some issues with performance, I use Aikar's flags, the machine is only hosting this server and if needed I have a lot of ram to spare but I believe it isn't needed. We are at most 5 players online but the modpack is quite heavy, it is also running Distant Horizons on the server side and even thought I am the only client with it, I can only assume that it takes a lot of resources. I see what appears like gc issues but I am clueless if they're a result of misconfiguration or some mod. I tried to increase the server's ram from 6Gb to 8 but I still see the same issues, is not unplayable but the tps can lower a bunch sometimes. I leave here the reports from before the change and after, the first report is more laggy but it has more players than the second one so it's not a good comparison. I would be really grateful if someone more knowledgeable could take a look.


Spark report with 6Gb: https://spark.lucko.me/jgpI0d3Ub3
With 8Gb:
Spark report: https://spark.lucko.me/MUAa6rNMBW
Latest log: https://mclo.gs/yZGNDkL
Heap summary: https://spark.lucko.me/Nv1TVvMVJ4