spacing=nonfrench Abstract All major web browsers now support WebAssembly, a low-level bytecode intended to serve as a compilation target for code written in languages like C and C++. A key goal of WebAssembly is performance parity with native code; previous work reports near parity, with many applications compiled to WebAssembly running on average 10%10\% slower than native code. However, this evaluation was limited to a suite of scientific kernels, each consisting of roughly 100 lines of code....