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Massive Sporadic FPS Drops Explained:

The problem originates from unoptimized meshes taken from various modder's resource pack in Skyrim LE, notably Oaristys' meshes. The lag occurs when the game pointer hovers over one of these meshes, triggering massive frame-rate loss. Since Locaster uses the same mesh packs in all of his mods, the spikes are prevalent in all LC house mods, in addition to all mods that utilize the same packs (Ex. Distinct Interiors). As an example, I believe "/data/meshes/oaristys/paper/rackcommonscrolls.nif" is one of the frequent culprits.

A temporary fix is to console disable the problem meshes in game. In other words, when you experience sudden massive fps loss, use the console to disable the current static object under your pointer. Your fps should immediately increase after doing so.

The true fix will be for someone to extract the BSA, and correct the meshes located in "data/meshes/oaristys/" for Skyrim SE. Another option is to remove the statics utilizing these meshes entirely from the plugin. Unfortunately, The former solution is beyond my level of modding ability.

Hopefully someone will read this post, and perform the necessary changes to this great mod.