InstantReload

When a resource pack is toggled, the vanilla game rebuilds every texture atlas. InstantReload checks which textures differ after the change and reloads only the atlases they belong to, which shortens reload time and reduces lag spikes. The vanilla reload lifecycle is kept intact, so the mod changes how the work is done rather than what the game expects from a reload.

The mod is aimed at development workflows that reload resources often, and at large modpacks where rebuilding atlases is expensive. It modifies the atlas reload pipeline through mixins. If it finds an inconsistency, it falls back to a full vanilla reload, so the client stays on a safe path. Because it alters the texture atlas rebuild process, the mod can conflict with other mods that change the same code.

The mod runs on the client alone, with files for Fabric. Builds cover 1.20.1 – 1.21.11, and the latest file is 0.9.3 for 1.21.11, published 2026-02-23. It is released under All rights reserved and is not open source, though its source code and issue tracker are public.