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CurseForge · Minecraft mod
Overlooked Optimizations
It's what you overlook that matters most.
Choose a version Pick your version below, then grab the matching file.
Quick answer
Which Overlooked Optimizations release matches 1.20?
Best match for your filters overlooked-1.0.0+mc1.20.1-universal.jar
Game version 1.20.2, 1.20.5, 1.20.1
Loader Fabric, Forge
Overlooked Optimizations overlooked-1.0.0+mc1.20.1-universal.jar targets 1.20.2, 1.20.5, 1.20.1 with Fabric, 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 Overlooked Optimizations 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 Fabric, 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.
What else does Overlooked Optimizations overlooked-1.0.0+mc1.20.1-universal.jar need?
overlooked-1.0.0+mc1.20.1-universal.jar on 1.20. Every mod below is checked against that same setup.
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 Overlooked Optimizations without breaking your instance.
Built for Overlooked Optimizations overlooked-1.0.0+mc1.20.1-universal.jar on 1.20. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use overlooked-1.0.0+mc1.20.1-universal.jar. It targets 1.20.2, 1.20.5, 1.20.1 with Fabric, 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 overlooked-1.0.0+mc1.20.1-universal.jar. It opens that exact file at the source.
About this project
What does Overlooked Optimizations add?
Most performance mods focus on rendering or chunk loading. Overlooked fixes the unoptimized game loop routines Mojang left behind that quietly eat your tick rate.
Most Prominent Features:
- Sleeping Armor Stands: Stationary armor stands stop running heavy collision checks every tick until something actually touches or damages them.
- Villager Gossip Fix: Villagers in trading halls stop constantly recalculating unchanged reputation data with each other.
- Trapped Mob Pathfinding Backoff: Mobs stuck in 1x1 pens or boats stop spamming pathfinding attempts toward players or villagers they can't reach.
- Hopper Minecart Sleep: Hopper minecarts won't scan for items if the track section is completely empty.
- Unstackable Item Merge Fix: Piles of swords, bows, and armor in grinders stop lagging the game with useless merge checks.
- Fluid Flow Caching: Water and lava stop rechecking the exact same drop-off blocks dozens of times in a single tick.
Benchmarks (Vanilla vs Overlooked Only):
| Test Scenario | Vanilla (20 TPS Cap) | Overlooked Only (Max Throughput) |
|---|---|---|
| Idle World | 4.8 ms / tick (~180 FPS) | 0.12 ms / tick (8,626 TPS) |
| 50 Villagers (Trading Hall) | 22.4 ms / tick (~85 FPS) | 0.03 ms / tick (29,612 TPS) |
| 50 Armor Stands | 11.2 ms / tick (~120 FPS) | 0.02 ms / tick (56,303 TPS) |
| 20 Hopper Minecarts | 15.6 ms / tick (~100 FPS) | 0.03 ms / tick (33,261 TPS) |
| 20 Unstackable Items | 12.8 ms / tick (~110 FPS) | 0.02 ms / tick (51,380 TPS) |
| Everything at Once | 48.5 ms / tick (~40 FPS) | 0.02 ms / tick (61,008 TPS) |
Note: In vanilla, hitting 50.0 ms causes server lag and skipped ticks. Under full load, vanilla chokes at 48.5 ms, while Overlooked stays under 0.03 ms.
You are free to include this Mod in your Modpack
Project description from CurseForge.
Pick your setup
Overlooked Optimizations by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
Minecraft version
1.21.11
2 loader buildsMinecraft version
1.21.10
2 loader buildsMinecraft version
1.21.9
2 loader buildsMinecraft version
1.21.8
2 loader buildsMinecraft version
1.21.7
2 loader buildsMinecraft version
1.21.6
2 loader buildsMinecraft version
1.21.5
2 loader buildsMinecraft version
1.21.4
2 loader buildsMinecraft version
1.21.3
2 loader buildsMinecraft version
1.21.2
2 loader buildsMinecraft version
1.21.1
2 loader buildsShowing the newest 12 of 20 game versions. Older files are in the list below.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Overlooked Optimizations versions and loaders
overlooked-1.0.0+mc1.20.1-universal.jar
24 Oct 2026
Client Source doesn’t say Server Source doesn’t say Dependencies No extras listed Listed on Release listing
Check the 1.20 · Fabric setup 1.20.2Fabric1.20.51.20.1 release
Looking for an older file? The official CurseForge project page is in Resources.
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