ModpacksJava
Astonishingly Swift
A modpack combining multiple optimization mods, bringing the best performance while keeping the experience to OptiFine as close as possible.
⬇ Download on Modrinth
Astonishingly Swift
Previously known as yuriko's optimization pack
FROM a0.5 ONWARDS, JAVA 22 OR LATER IS REQUIRED FOR SELECT MODS.
PLEASE USE JAVA 25, WHICH IS PRE-INSTALLED WITH MODRINTH AND CAN BE SELECTED IN INSTANCE SETTINGS.
This is Astonishingly Swift. This pack focuses on delivering the best performance on any PC, while keeping OptiFine features, like zooming and dynamic lights.
For the best performace, give the pack 4GB(4096MB) or more RAM. Don't give the pack more than half of your RAM capacity.
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.5
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Downloads as yuriko's optimization pack a0.6.mrpack
- Download size: 7 KB
- Download link checked 6 Sept 2026 — working
These come from our own check of the pack file, not from the source page.