CurseForge · Minecraft mod

Achievements Optimizer

Improved achievement performance

Choose a version Pick your version below, then grab the matching file.

Quick answer

Which Achievements Optimizer release matches 1.20.4 Forge?

Updated last month

Best match for your filters AchievementOptimizer-1.20.4-1.1.0

Game version 1.20.4

Loader Forge

Achievements Optimizer AchievementOptimizer-1.20.4-1.1.0 targets 1.20.4 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. No extra mods listed for this file.

Where it goes

Is Achievements Optimizer required on the client, server, or both?

The project page does not say whether this file belongs on the client, dedicated server, or both.

Client Source doesn’t say

Dedicated server Source doesn’t say

Loader for this release Forge

Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume

The source does not explicitly classify this release as client-only or server-only.

Understand client and server requirements Read the Minecraft installation guide

What else does Achievements Optimizer AchievementOptimizer-1.20.4-1.1.0 need?

AchievementOptimizer-1.20.4-1.1.0 on 1.20.4 Forge. Every mod below is checked against that same setup.

No extra mods listed for this file

This file does not list any required mods. Do not add a library just because a different file uses it.

This file does not list any required or optional mods.

Before you install it

Add Achievements Optimizer without breaking your instance.

Built for Achievements Optimizer AchievementOptimizer-1.20.4-1.1.0 on 1.20.4 Forge. Pick another file and the loader, install side or required mods may change.

01
Stick to this file

Use AchievementOptimizer-1.20.4-1.1.0. It targets 1.20.4 with Forge; another release may have different loader, side or dependency requirements.
02
Bring the mods it needs

This file does not list any required mods. Do not add a library just because a different file uses it.
03
Put it on the correct side

The project page does not say whether this file belongs on the client, dedicated server, or both.
04
Pick the file you checked

Use the “Get this file” button beside AchievementOptimizer-1.20.4-1.1.0. It opens that exact file at the source.

About this project

What does Achievements Optimizer add?

Achievements Optimizer is a lightweight performance mod that optimizes how item-based achievements and advancements are processed — reducing unnecessary inventory scans and improving overall tick efficiency.

It doesn’t change any gameplay mechanics or logic — only makes achievement checks faster and cleaner under the hood.

⚙️ Key Optimizations

Early tick skipping — heavy slot calculations (empty/occupied/full) are skipped early, preventing extra work per event.
Instant empty stack discard — with ignoreEmptyStacks enabled, empty stacks are removed immediately without scanning the entire inventory.
Fast multi-item matching — single-pass inventory check using boolean[] flags with early exit. No allocations, noticeably faster on large inventories or long condition lists.
Early slot filtering — slots.matches(full, empty, occupied) is evaluated first, avoiding deeper checks when slots don’t match.
Preserved fast path for single targets — when items.size() == 1, the comparison is done directly on the changed slot without a full inventory pass.

🚀 Result

Fewer redundant checks, less memory churn, and faster responses to inventory events.
Particularly beneficial for servers or modpacks with many players and complex advancement triggers.

From version 2.0.0 required Forge Config API Port(only for fabric version).

Feel free to write about all problems and suggestions on my github! Good luck!