After weeks of patching, a breakthrough: the first stable 1.12.2 survival world running entirely in Wasm GC mode. Chunk loading was snappy. Entity AI computed faster. And the memory footprint? Down 30% — because Wasm GC structs are far more compact than JS objects.
WebAssembly Garbage Collection is a new proposal that allows compiled languages (Java, C#, Kotlin) to manage memory using the browser’s built-in GC, rather than emulating it in JavaScript or manually managing linear memory. For Eaglercraft, this was revolutionary. eaglercraft 1.12 wasm gc
Alex recompiled the 1.12 client using a custom TeaVM fork targeting Wasm GC. Instead of outputting JavaScript heap management, every object allocation, every new BlockPos() , every HashMap of entities — all became Wasm GC structs and arrays, traced and collected by the browser’s optimized garbage collector. After weeks of patching, a breakthrough: the first stable 1