Lithium 0.15.2 for Minecraft 1.21 and 1.21.1 backports an optimization and bug fixes.
Make sure to take a backup of your world before using the mod and please report any bugs and mod compatibility issues at the issue tracker. You can check the description of each optimization and how to disable it when encountering a problem.
Additions
- Optimize non POI block searches (Thanks to jcw780)
Fixes
- Fix incorrect hopper sleeping with double chests halves read by comparators