wasm itself is a bit slower than code compiled for a particular CPU. However, there is significant overhead when it comes to the browser. This is because, now,

wasm itself is a bit slower than code compiled for a particular CPU. However, there is significant overhead when it comes to the browser. This is because, now, wasm has to use JavaScript to talk to the browser. The performance gain/loss will depend on the type of operations you are doing. There are plans, however, for wasm to have direct access.