Either way, the delay slots do useful work: they compute the descriptor address and start reading it from memory. By the time the PLA verdict arrives, the hardware is already prepared for whichever path is selected. No cycles are wasted.
The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
，这一点在搜狗输入法下载中也有详细论述
Ultimately, this is a placeholder solution so that more time can be spent on fingerprinting and identifying headless browsers (EG: via how they do font rendering) so that the challenge proof of work page doesn't need to be presented to users that are much more likely to be legitimate.
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，更多细节参见heLLoword翻译官方下载
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