Lazy DataFixerUpper(LazyDFU) [FORGE]

This project is a Forge adaptation of the LazyDFU mod originally created by developer tuxed for Fabric. Permission for porting is granted under the terms of the MIT license.

LazyDFU is an optimization mod that changes how DataFixerUpper works by making its initialization "lazy". Instead of immediately creating all the rules for migrating data from older versions of Minecraft to newer ones, it postpones this process until it's actually needed. The mod does not modify the DFU structure itself and is considered safe, but additional caution is recommended when using it.

The main idea behind LazyDFU is simple: in most cases, you won't need to convert data for every game version. Thanks to this, DFU rule compilation occurs later, when the game is already running. This may cause temporary lag if LazyDFU forces the game to compile migration rules, but once the process is complete, performance won't be affected.

Proof of Effectiveness

The effectiveness of LazyDFU can be clearly demonstrated through a video showing how much it speeds up game startup.

Comparison with Other Mods

Cadmium

LazyDFU perfectly complements Cadmium. While Cadmium addresses the problem of slow rule optimization, it only partially improves the situation. LazyDFU remains highly effective by delaying the initial compilation of DFU rules until necessary, significantly speeding up game startup.

Smooth Boot

LazyDFU uses an approach similar to Smooth Boot: both mods don't attempt to modify DFU. However, LazyDFU surpasses Smooth Boot because it doesn't compile DFU rules at startup at all, which is the most resource-intensive part of the game launch process. Smooth Boot, in contrast, limits the number of threads compiling DFU rules and runs them with lower priority.

Mods That Remove DFU

Mods that completely remove DFU are fundamentally unsafe. Loading an old world with such a mod will corrupt it. Some have protective mechanisms, but even that doesn't guarantee the absence of issues. In comparison, using LazyDFU might only result in temporary lag, which is far better than complete world loss. Therefore, it's recommended to choose LazyDFU over solutions like DataBreaker.