29.06 03:50:59 [Server] WARN Roguelike Dungeons loaded a new chunk [-136, 26] in dimension 0 (overworld) while populating chunk [-135, 25], causing cascading worldgen lag.
29.06 03:50:59 [Server] WARN Please report this to the mod's issue tracker. This log can be disabled in the Forge config.

Probably nothing you can do about this, but I figure I'd just put it here in case there is a fix for it. The mod pack I am using seems to be pretty chonky for no real reason when loading chunks. And it seems to be because of mods doing this.

This is due to the way that forge handles chunk generation, AFAIK there is nothing you can do as a player. A possible fix is to check your logs and look to see if the overflow is caused by another mod conflicting with Roguelike, for me it was TAIGA. Hope this helps!

Edit: Other people know more about this, so don't count on me.