andrzejczaklight

BadOptimizations by thosea - lightmap updates, debug logic, sky color calculation
Better Block Entities by cseden - block entities rendering
Concurrent Chunk Management Engine (Fabric) by ishland - chunk generation
Dynamic FPS by juliand665 - background framerate
Entity Culling by tr7zw - not visible entities rendering
Fast Noise by ZenXArch - world generation
FerriteCore by malte0811 - memory usage
ImmediatelyFast by RaphiMC - immediate mode rendering
Ixeris by decce6 - event polling
Krypton by astei - multiplayer networking stack
Lithium by jellysquid3 - game logic
ModernFix-mVUS by Coredex - game launch, memory usage
More Culling by FX - not visible things other than entities rendering
ScalableLux by ishland - light updates
Sodium by jellysquid3 - game rendering
ThreadTweak by getchoo - thread scheduling
Very Many Players (Fabric) by ishland - game simulation, multiplayer high player count

Cloth Config API by shedaniel - More Culling dependency
Fabric API by modmuss50 - most mods dependency

In the Modrinth App, Prism Launcher, or ATLauncher, there should be added a new instance with the downloaded mrpack file imported. If the version is not detected, 1.21.11 with the most recent version of Fabric mod loader must be used

First, downloaded mrpack file needs to be converted to zip using an external tool. If it has never been done, Fabric installer must be downloaded and ran with the most recent loader version for 1.21.11 chosen. After that a new instance should have been created in the game launcher

Next - inside .minecraft in the %appdata% file directory in Windows, ~/Library/Application Support/minecraft in macOS, or ~/.minecraft in Linux - config, mods, resourcepacks, shaderpacks, and options.txt (provided they exist) have to be removed and then replaced with the contents of the zip file