Server lag when players using Elytra

I recently started hosting a Vault Hunters 3 server. We've noticed some lag when one of us uses an Elytra and starts loading in a bunch of chunks quickly.
I don't really know how chunk generation works. I also don't know if one of those pre-generation mods will work well with modpacks and if there are any "gotchas" that I should be aware of.

Does anyone happen to know what the best way to solve this might be?

For context, I'm running on:

2x Gold 6148 2.4GHz -> 40 Cores
512gb RAM. (Xmx16G -Xms16G)
1 TB FS on SSD (but I have much more available)
Was this page helpful?