Alternate Current vs Krypton

Alternate Current is a free, MIT-licensed mod for Minecraft: Java Edition that changes how redstone dust calculates power and updates blocks. It builds networks from connected wires and spreads power from wires receiving power outside a network. The project says this makes updates deterministic and less dependent on location, while retaining high Vanilla parity.

The mod focuses on reducing server work. Its README says redstone dust contributes up to 20 times less MSPT with Alternate Current, and that network-level optimizations can reduce updates by up to 20%. Listed Minecraft versions include 1.14 through 1.21.11, with some specific releases also listed; supported versions and loaders vary by release. Modrinth lists Fabric, Forge, NeoForge, Ornithe and Quilt, and server-side and singleplayer environments. The project links to its source repository, issue reporting and a Discord server. Its GitHub repository has no detected security policy and no published security advisories.

Krypton is a free Fabric mod that optimizes Minecraft networking and entity tracking, with its performance work directed mainly at servers. It works on both clients and servers, including dedicated servers. Its network handlers are based on optimized Netty handlers from the Velocity proxy, using native code where appropriate. Flush consolidation is intended to reduce server CPU use and tick times and lessen the impact of speculative-execution hardware vulnerabilities. Other small optimizations target memory use and packet serialization speed. Krypton is tuned for Linux, though it should work wherever Minecraft can run. CurseForge lists Fabric and Quilt as supported loaders. The project aims to work with Fabric API, Lithium, and Sodium; compatibility with other mods is best effort. It is licensed under LGPL-3.0-only, and the maker does not guarantee stability, compatibility, or support for every setup. The project is described as feature-stable, while updates for newer Minecraft versions depend on the maker's availability and need. Listed compatibility includes Minecraft Java Edition versions 1.16.2 through 1.16.5, 1.17.x, 1.18.1 through 1.18.2, 1.19.x, 1.20.x, 1.21.x, and 26.1 through 26.3.