The article doesn't mention the number/class of CPUs in the system used for the benchmark. It claims that 'Singlepass' compilation of clang.wasm took 2s and 'Cranelift' took 9s.

Running the same benchmark myself in Linux on a 4CPU VirtualBox on a MacBook Pro, I see 11s and 42s respectively. For reference , V8/Node.js compiles the same file in 27s.

Compiled files were 339 MiB (Singlepass), 640 MiB (Cranelift) and 90 MiB (V8/Node.js).

Clang.wasm itself is 45 MiB.