Mezz changed Forge to force mipmapping even on improperly sized textures and it is causing frame drops for some reason.

Resize our flugel tiara textures from 20x20 to 32x32 or 60x60 to 64x64 so that they mipmap properly:

Original report: williewillus/Botania#462
Originally posted by williewillus on the now defunct BotaniaV2 repo.