Delay Packets
by AgentCubical
Delay Packets lets a client hold back its incoming and outgoing network traffic, so testers can reproduce high-ping conditions on demand.
What it does
Players and testers can introduce artificial delay to the packets a client sends and receives. The mod is aimed at debugging plugins and servers in situations where a client experiences high ping or packet loss, since those conditions are hard to reproduce on a stable connection. It simulates both high and inconsistent latency, which introduces unpredictability into the network path and can reveal bugs or unexpected behavior that only appear under such conditions.
The tool is intended for debugging a personal server or for testing where explicit permission has been given. Results can vary between servers. Using it on servers without permission may lead to bans, and the creator states the mod is intended strictly for educational purposes and takes no responsibility for resulting bans. Fabric API is required; Cloth Config API and Mod Menu are optional. The mod is client-side only and is released under All rights reserved, so it is not open source. Files exist for 1.19 – 1.19.4 on Fabric and Quilt, with source code and an issue tracker linked publicly.
Key features
Incoming packet delay
Packets the client receives can be held back for a set time before they are processed.
Outgoing packet delay
Packets the client sends can be held back before they leave, simulating a slow upstream link.
Latency simulation
Both steady high ping and inconsistent, irregular latency can be reproduced with the same tool.
Packet loss scenarios
The delay tooling helps test how plugins behave when a client on a poor connection loses packets.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Optional 2
Use cases
Who it’s for: Plugin developers and server owners who test their own servers, with permission from the server owner, under conditions that resemble a slow or unstable connection.
How it compares
Portal Delay Skip is a Fabric mod for 1.19 – 1.19.3, released under the GNU General Public License v3.0 only and open source, and it runs on client and server. Packet Logger is open source under the Apache License 2.0, runs client-side only on Fabric for 1.19.2 – 1.20.4, and records packets rather than delaying them. Packet Auth is published for Fabric and Quilt across 1.18 – 1.21.5 under All rights reserved, and it is needed on both client and server, unlike Delay Packets.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Delay Packets | Fabric and Quilt | 1.19 – 1.19.4 | Client-side only | 2023-12-09 |
| Portal Delay Skip | Fabric | 1.19 – 1.19.3 | Client and server | 2023-03-01 |
| Packet Logger | Fabric | 1.19.2 – 1.20.4 | Client-side only | 2024-07-12 |
| Packet Auth | Fabric and Quilt | 1.18 – 1.21.5 | Client and server | 2025-05-15 |
Questions
Does Delay Packets require Fabric API?
Does Delay Packets have to be installed on the server?
Which game versions does Delay Packets support?
In the catalog
Delay Packets is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 9,374 mods support Minecraft 1.19.4.
More from AgentCubical
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What the author says
The Packet Delay Mod is a versatile tool that empowers users to introduce delays to incoming and outgoing network packets. This functionality proves invaluable for debugging plugins, particularly in scenarios where clients experience high ping or encounter packet loss. To leverage this mod effectively, consider its…
Official listing
- Modrinth page
- modrinth.com/mod/delay-packets
- Owner
- AgentCubical
- Published
- 2023-06-17
- Updated on Modrinth
- 2023-12-09
- Facts verified
- 2026-10-15