Astonishingly Swift

Name: Astonishingly Swift
Price: 8 EUR
Author: yurikohun

A modpack combining multiple optimization mods, bringing the best performance while keeping the experience to OptiFine as close as possible.

by yurikohun

393 Downloads

0 Followers

fabricMC 1.21.5optimization

Rent Astonishingly Swift Server

Screenshots

About this Modpack

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.

Available Versions

a0.6alpha

MC 1.21.5fabric54 downloads

May 17, 2025

a0.5alpha

MC 1.21.4fabric24 downloads

May 14, 2025

b0.4beta

MC 1.20.6fabric55 downloads

August 4, 2024

b0.3beta

MC 1.20.4fabric72 downloads

January 13, 2024

b0.2beta

MC 1.20.2fabric114 downloads

September 27, 2023

How to Set Up a Astonishingly Swift Server

Order Server

Choose at least 4 GB RAM (6 GB recommended for Astonishingly Swift). Based on player count: per 8 players.

Install Modpack in Dashboard

Open the modpack browser in the dashboard, search for "Astonishingly Swift" and click "Install". The fabric loader and Minecraft 1.21.5 are configured automatically.

Start Server & Play

Start the server – all mods are loaded automatically. Share the server IP with friends and play together!

Frequently Asked Questions

Astonishingly Swift server crashes or won't start – what to do?

Most common causes: insufficient RAM or wrong fabric loader. Check latest.log for "OutOfMemoryError" → increase RAM to at least 6 GB. For "Mixin" or "ClassNotFoundException" errors: modpack version and loader don't match. With Mado Hosting, loader and Minecraft version are auto-configured on modpack install – preventing most startup issues.

How much RAM does a Astonishingly Swift server really need?

Minimum 4 GB, recommended 6 GB for stable performance. per 8 players. Important: Minecraft modpacks need more RAM than vanilla – plan extra per additional player. With Mado Hosting, you can scale RAM up live at any time without data loss (from €8/month).

Can I add custom mods to Astonishingly Swift without conflicts?

Yes, but check compatibility: only use mods for the same loader (fabric) and same Minecraft version (1.21.5). Common issues: ID conflicts with recipe mods and incompatible coremod versions. The Mado dashboard mod browser only shows compatible mods and warns about known conflicts.

Astonishingly Swift server lagging – performance tips

1) Increase RAM to 6 GB+. 2) Reduce server view-distance to 8 (server.properties). 3) Pre-generate chunks with the "Chunky" plugin. 4) Use /spark profiler to check which mods consume the most tick time. With Mado Hosting, all servers run on NVMe SSDs with dedicated CPU cores – eliminating hardware as a bottleneck.