The End of an Era

It is currently under active development

Just another optimization modpack — nothing special.
The base versions of the modpack were developed for Fabric,
which have been ported to Forge/NeoForge (thanks to Connector).

We use only effective mods to optimize the client

Achievement Optimizer — optimizes how item-based achievements and advancements are processed.
Clumps — groups EXP orbs together into a single entity to reduce lag when there are many in a small area.
Concurrent Chunk Management Engine — designed to improve the performance of chunk generation.
Dynamic FPS — reduce resources usage while Minecraft is in the background, idle, or on battery.
Enhanced Block Entities — reduce block entity FPS lag with almost no compromises.
Entity Culling — calculates line-of-sight visibility in real time and eliminates unnecessary draw calls.
Fast Noise — optimizes storing block and biome data into chunks for the duration of worldgen.
Fast Quit — lets you return to the title screen early while your world is still saving in the background.
Ferrite Core — optimizes and reduces Minecraft's memory usage in a few different ways.
Get It Together, Drops! — controls how dropped items combine on the ground to reduce lag.
Immediately Fast — improves rendering performance of the client's immediate mode.
Ixeris — buffered raw input and threaded event polling to improve client performance.
Language Reload — reduces load times and adds quality-of-life changes related to languages.
Lithium — improves a number of systems with the goal of not changing any vanilla mechanics.
Memory Leak Fix — fixes multiple random memory leaks in Minecraft for both the client and server.
Modern Fix — improves performance, reduces memory usage, and fixes many bugs in modern versions.
More Culling — changes how multiple types of culling are handled in order to improve performance.
Particle Core — particle culling, rendering optimizations, configurable type-specific spawn reduction.
Server Core — several patches and optimizations to improve performance and reduce lagspikes.
Sodium — greatly improves frame rates and micro-stutter, while fixing many graphical issues.
Starlight — rewrites the light engine to fix lighting performance and lighting errors.
Very Many Players — improves general server performance at high playercount.

Some additional mods for Sodium

Indium — provides support for the Fabric Rendering API, based on Indigo (not needed for Sodium 0.6.0+).
Reese's Sodium Extra — aims to bring most of OptiFine's eye-candy options that shouldn't be in Sodium.
Reese's Sodium Options — replaces Sodium's options screen with intention of improving user experience.
Sodium Shadowy Path Blocks — adds vanilla-like smooth lighting to non-full blocks when using Sodium.

We also use several mods that fix various issues

Bad Horse Fix — fixes horse markings appearing above horse armor when using Iris or Oculus.
Cubes Without Borders — allows you to play Minecraft in a borderless fullscreen window mode.
Debugify — replaces many mods and fixes over 70+ bugs found in the Minecraft bug tracking system.
Model Gap Fix — applies targeted UV/model-generation adjustments to fix gaps in block and item models.
No Chat Reports — strips cryptographic signatures, making your chat messages impossible to track.

Visual and atmospheric improvements

Continuity — allows resourcepacks to use Connected, Emissive, and Overlay textures without OptiFine.
Entity Model Features — designed for anyone who wants to use CEM resourcepack features from OptiFine.
Entity Texture Features — custom various entity textures and player skin features without OptiFine.
Nuit — custom skybox engine with keyframe-based transitions, rotation, and custom weather rendering.
Nuit Interop — provides compatibility for OptiFine/MCPatcher custom skies, allowing them to work with Nuit.
Iris — a modern shaderpack loader for Minecraft intended to be compatible with existing OptiFine's shaders.
Lamb Dynamic Lights — adds OptiFine's dynamic lighs to Minecraft (in case you don't play with Iris shaders).
Polytone — customizable colormaps, block colors, and block sounds with support for OptiFine format.
Presence Footsteps — adds new and more dynamic sounds for every block the player walks on.
Sound Physics Remastered — realistic sound attenuation, reverberation, and absorption through blocks.

Libraries for all the above mods

Cloth Config API — the most popular and widely used configuration library for Minecraft mods.
Config Manager — allows modpack developers to ship config files in a simple and user-friendly way.
Fabric API — provides common hooks and intercompatibility measures used by Fabric mods.
Fabric Language Kotlin — enables usage of the Kotlin programming language for Fabric mods.
Fzzy Config — provides a wide array of features above and beyond what you can find in other libraries.
Mod Menu — allows you to view your installed mods and provides quick and easy access to their settings.
Yet Another Config Lib — a builder-based configuration library created to fill a gap in this area of modding.

Differences between modpack versions

The mod list may vary depending on the version (1.20.1 or 1.21.1) and/or mod loader (Fabric / Forge / NeoForge).
Please refer to the Versions section for the mod list for your specific modpack version (scroll down to the bottom).

Spark Profiler for version 0.1.0+1.20.1-Fabric

[Render thread/WARN]: Game took 13.589 seconds to start.
[Render thread/WARN]: Initial datapack load took 675.4 ms.
[Render thread/WARN]: Time from main menu to in-game was 1.8011396 seconds.
[Render thread/WARN]: Total time to load game and open world was 15.39014 seconds.

Spark Profiler for version 0.1.0+1.20.1-Forge

[Render thread/WARN]: Game took 21.968 seconds to start.
[Render thread/WARN]: Initial datapack load took 751.7 ms.
[Render thread/WARN]: Time from main menu to in-game was 2.206881 seconds.
[Render thread/WARN]: Total time to load game and open world was 24.174881 seconds.

Spark Profiler for version 0.1.0+1.21.1-Fabric

[Render thread/WARN]: Game took 14.305 seconds to start.
[Render thread/WARN]: Initial datapack load took 785.6 ms.
[Render thread/WARN]: Time from main menu to in-game was 2.3327239 seconds.
[Render thread/WARN]: Total time to load game and open world was 16.637724 seconds.

Spark Profiler for version 0.1.0+1.21.1-NeoForge

[Render thread/WARN]: Game took 20.364 seconds to start.
[Render thread/WARN]: Initial datapack load took 907.1 ms.
[Render thread/WARN]: Time from main menu to in-game was 2.5274174 seconds.
[Render thread/WARN]: Total time to load game and open world was 22.891418 seconds.