《▒ So what does JEI Rewired actually do? ▒》

JEI is great until you throw it into a pack with a few hundred mods, tens of thousands of recipes and plugins doing god knows what on startup (reincarnation of hell)...

Then you join a world, everything freezes and you get to stare at Minecraft for the next 10 seconds like you don't have anything else to do in life... Beautiful

JEI Rewired goes after the actual work causing that. Recipe registration gets cheaper, ingredient filtering stops doing so much pointless work, and JEI can start through Quantified API without keeping the client thread blocked for the whole thing like other competitor mods do xd.

《▒ Where the speed comes from ▒》

Recipe processing
JEI's vanilla plugin has quite a bit of repeated work when registering recipes. Rewired makes that path cheaper without changing the recipes it gives back.

Ingredient filtering
The filter doesn't need to spend two whole seconds doing something that can finish in a fraction of that time xd.

Background startup
Suitable JEI startup work runs on a Quantified API worker. Screens, runtime handoff and other client-sensitive parts still go through Minecraft's client thread.

Search preparation
The search index is built in the background. Once it's ready, Rewired warms the search path so your first search doesn't randomly pay for cold code as well.

Plugin fallback
If a plugin actually fails during background startup, Rewired retries the normal client-thread route and disables further background attempts for that session.

《▒ The actual numbers (as always) ▒》

Tested in a 237 mod Forge 1.20.1 pack on a Ryzen Z1 Extreme (Aka ROG ALLY) with JEI 15.59.0.212. It has 77,070 recipes, Create, KubeJS, Refined Storage, Immersive Engineering, TaCZ and a whole lot more.

The biggest difference is the large as hell freeze. With background startup, the longest observed cold join gap was 4.0 to 6.3 seconds in this pack (yikes...).

These are results from one pack and machine, not a guaranteed speedup on every PC!!! Background startup may take longer on the worker because it overlaps world loading (genuine possibility!!!!!!!).

《▒ And the recipes? ▒》

All 77,070 of them are still there.

The same 13,098 items, 113 fluids, 116 visible categories, recipe sets and search results as normal JEI in the tested pack.

Rewired doesn't hide anvil recipes, throw out grindstone entries or conveniently forget about half the pack just to make startup look faster (Fun fact: other alternatives do so).