A big thing overlooked with speed is binary size. WebAssembly is incredibly inefficient at storage space. For people still on DSL they will have to wait seconds (or minutes in the case of Godot) for the blob to download before execution can start.
Meanwhile javascript will be much faster to download since it is smaller and javascript can execute while it is downloading.
Meanwhile javascript will be much faster to download since it is smaller and javascript can execute while it is downloading.