So, I'm profiling the start of a large modpack right now (All The Mods Remix) and found that BottlerRecipeMaker#getBottlerRecipes takes a long time to complete.

The largest amount of time is spend on copying the itemstack, so my question is if the itemstack needs to be copied at all.
I sadly do not know this code well enough to judge this.

Build 5.8.2.384 should work better with this, but if there is still a hotspot things can probably be improved more.

did this help @ichttt ?

Yes, it improved things a lot from what I could see

cool, let us know if there's anything else that is slow