You must add garbage collection flags to these java arguments. These optimized flags run with any Java 11+ build. If you dont know what to pick, I recommend GraalVM EE (see below) or the latest Adoptium Java 17 JRE: Ĭouleur maintains a good running list of JREs here: Base Java Flags See FAQ, the Benchmarks folder, and this Gist for low memory consumption flags. much slower in Minecraft, and uses totally different flags than any other Java build, but it does consume less memory than OpenJDK-based runtimes. Red Hat Java 8 has the Shenandoah garbage collector. Note that you must roll back to the Java 17 release, and that Java 18 reverts some of the performance enhancements.Īzul's Prime OpenJDK is very fast since it hooks into llvm, but its currently incompatible with most mods and is linux-only. Grab it from Clear Linux's repos via swupd, from Distrobox, or from Docker. Intel's Clear Linux OpenJDK uses the same code as any other OpenJDK (making it highly compatible), but the build process itself and the dependencies are optimized for newer CPUs. This is what I personally run Minecraft with, see the GraalVM section below. Oracle GraalVM Enterprise Edition features a more aggressive Java compiler. Java runtimes from Azul, Microsoft, Adoptium, Amazon and so on are basically identical. Sometimes Java 11 will work where Java 17 doesn't.ġ.12.2 and below generally requires Java 8. Some launchers like Curseforge and Prism Launcher ask you to use Java 8 on 1.16.X, but Minecraft 1.16.5+, all 1.18+ mods, and most 1.16.5 mods are compatible with Java 17. Picking a Java Runtimeįor Minecraft 1.16.5 and up, use Java 17. And they are no substitute for clearing laggy things out with mods like Spark or Observable.ĭiscord for questions and such: BenchmarksĪll flags are tested with Benchmark.py script. While these tweaks notably reduce some server and client stutters, expect only modest TPS gains + minimal FPS gains at best, and somewhat increased RAM + CPU usage. Every flag and tweak is individually benchmarked to test for regressions, and checked against Java defaults to avoid redundancy. This is a guide to tune Java for Minecraft.
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