It appears that the Quark Monster Boxes cause chunks to stay loaded on a server. This causes a lot of tick issues when exploring on a server, especially when you have lots of people trying to explore.

Monster Boxes On:
Pastebin

Monster Boxes Off:
Pastebin

As you can see when they are on the server is constantly trying to keep up in ticks but turned off it appears to work great. the only change made between the 2 posts is changing the monster box spawn.

Forgot to add version: Quark-r2.1-245, Minecraft 1.15.2, forge-31.2.36

I am on the modpack Valhelsia2 but I also had a similar issue in MCEternal