1.20.1
Deorum Ver. 1.44

Having even one Sieve placed down and rendering in my fov causes FPS to drop from around 100 (1% high for this modpack) to 28fps. I can't really tell why but my ram allocation rate goes up significantly as well when this happens.

Closing Issue for now bc I'm pretty sure its some weird interaction between this and another mod (of which its likely that other mods fault)

yeah this turned out to be a bug with the mod "Carry On" which affected multiple different mods I was using with various modded entities and tile entities, to include the Sieves. Will report there, just leaving this for if other people have this issue (I only noticed it happening bc of a skyfactory esc modpack im developing)