If you look at all of the JS glue code for the single call to console.log above, you’ll see that there is a lot of overhead. Engines have spent a lot of time optimizing this, and more work is underway. Yet this problem still exists. It doesn’t affect every workload, but it’s something every WebAssembly user needs to be careful about.
Iframes and the Shadow DOM
，这一点在体育直播中也有详细论述
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why I think that, even at a 0.x stage, it’s well worth asking