WASM GC works seamlessly with JavaScript Promises and Web Workers. Eaglercraft 1.12 can now offload chunk loading, world generation, and lighting calculations to separate workers, while the main GC runs concurrently. No more stutters when the garbage collector kicks in.
Eaglercraft 1.12 with WASM GC isn’t just a tech demo anymore—it’s a genuinely smooth browser Minecraft experience. If you’ve written off web-based Minecraft due to lag, give the WASM GC version a shot. The future of browser gaming is compiled, not interpreted.
| Metric | Old Eaglercraft (Custom GC) | Eaglercraft 1.12 with WASM GC | |--------|----------------------------|--------------------------------| | Initial download size | 45 MB (compressed) | 28 MB (compressed) | | RAM usage | ~1.2 GB (leaks over time) | ~600 MB stable | | Garbage collection pauses | 80–150 ms (every 5–10s) | 2–5 ms (incremental) | | Average FPS (Vanilla 1.12) | 30–45 FPS | 55–70 FPS | | Mod compatibility | None or extremely limited | Basic Forge mods possible | eaglercraft 1.12 wasm gc
which is specifically optimized to handle the data packets coming from the WASM client. BungeeCord/Velocity : Ensure your proxy is configured with the Eaglercraft XB
Players can find the 1.12 WASM-GC client through community-hosted mirrors such as MC.JS.COOL or GitHub-hosted pages like HappinessAD . When launching, many of these sites will provide a prompt to "Continue with JavaScript" or "Launch WebAssembly Version"—choosing the latter will trigger the high-performance engine. WASM GC works seamlessly with JavaScript Promises and
Their first attempt was a prototype: compile a tiny subset of the Minecraft server’s object model into a WASM module using an experimental compiler that emitted GC-aware WASM. The module defined struct types for Blocks, Entities, and NBT-like containers, with reference fields and explicit type checks. On capable browsers with experimental WASM GC flags enabled, the demo ran — blocks spawned, entities moved, and the memory profile looked promising: fewer fragmented JS objects, lower heap pressure in DevTools, and smoother frame rates.
From community benchmarks (Chrome 120+, Firefox 122+): Eaglercraft 1
The original Eaglercraft (1.8.8) relied on in WebAssembly. Here’s the issue: Java automatically handles memory cleanup with a Garbage Collector (GC). WebAssembly, in its original MVP (Minimum Viable Product) spec, did not have a built-in GC. To run Java bytecode in WASM, developers had to:
For offline play, the WASM GC version is bundled into a downloadable ZIP file (typically named Eaglercraft_1.12_WASM_Offline_Download.zip ), which can be extracted and loaded locally.
Eaglercraft 1.12 is more than just a way to play Minecraft at school or on a Chromebook; it is a proof-of-concept for the future of the web. By proving that a massive, resource-heavy Java game can be compiled into WASM GC and run flawlessly in a browser tab, it opens the door for developers to port other complex desktop applications and games directly to the web without compromising on performance.
While WASM GC reduces GC overhead compared to running a full Java runtime inside linear memory, it still introduces occasional stop-the-world pauses. Frequent, large-scale GC events — such as those triggered when unloading a large world chunk — can cause momentary lag spikes and frame drops.
