WebAsm is an intermediate not a source language. Initial in-lining & other optimization have already been performed long before it hit your browser. There could

WebAsm is an intermediate not a source language. Initial in-lining & other optimization have already been performed long before it hit your browser. There could potentially be a JIT or similar to do a secondary optimization pass in the browser if something is hot, but it's probably going to be largely considered a codegen issue rather than a runtime issue.