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I believe that document.write prevent a lot of parallelism. Also as always, SIMD are underutilized. There is also transactional memory, heterogeneous computing, SYCL, etc...

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what do you mean document.write prevents parallelism? Who's using document.write for anything these days?

"Who's using document.write for anything these days?" It doesn't matter if anybody use it, someone could use it, as such browser must adapt to this possibility and be performance constrained.

"what do you mean document.write prevents parallelism?" I don't remember the details but it force some critical browser operations to be sequential.

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