It was noticed [a long time ago](https://github.com/AssemblyScript/assemblyscript/pull/1700#issuecomment-784557145). Not sure it affect to native binaryen but binaryen.js since v99 definitely have slower optimization / compilation. `assemblyscript.wasm` optimized compilation: ``` with binaryen.js v98: 4.13s with binaryen.js v100: 7.22s ``` unoptimized builds (without any optimizations) also slower