What's new
I finally tracked down and eliminated the lag with larger colonies.
To fix it I have to remove MixinBootstrap, which unfortunately is a dependency for Immersive Portals.
Forge Updated to 31.2.27
Mods Updated
AppleSkin to 1.0.14
Atmospheric to 1.4.1
Bloomful to 1.4.1
Crafting Tweaks to 11.0.1
CraftTweaker to 6.0.0.31
JEI to 6.0.2.12
Light Overlay to 4.7.0
Minecolonies to 0.13.8-ALPHA-universal
Refined Storage to 1.8.6
Refined Storage Addons to 0.6.2
Silent Gear to 1.8.1+108
SilentLib to 4.6.3+55
Silent's Mechanisms to 0.7.3+53
Structurize to 0.13.1-ALPHA
Swamp Expansion to 1.7.2
The Endergetic Expansion to 1.3.2
V-Tweaks to 3.1.7
Waystones to 6.0.2
Removed Mods
Immersive Portals
MixinBootstrap
This mod has no additional files