Many moons ago I was preparing for an interview to join wasmer, back then they showed me that by running wasmer as a kernel extension in Linux they have made it run four orders of magnitude (10,000 times) faster. Given the WASI, I keep thinking more than the plugin usability of things like wasmer, what is the point of WASM not being accepted as a second binary in all operating systems? Windows could support .exe as well as .wasm for example and we would finally have a cross-plaform binary. Apple would never accept; Microsoft will do, and Linux can simply have,

Such speedup is not plausible at all. It had to be a flawed benchmark relying on some API being very slow in userspace (probably on purpose, not using it the right way). The raw execution speed of WASM can't change much just because it is in a kernel.