In my experience (Gio projects), WASM is very slow compared to native code; my investigations are part of #32591. You may find https://github.com/golang/go/issues/32591#issuecomment-517835565 relevant, because I cut out rendering to eliminate the JS<=>Go crossing overhead. It was a ~10x difference in 2019 and I don't think anything major has changed since then.
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