Backpressure — the ability for a slow consumer to signal a fast producer to slow down — is a first-class concept in Web streams. In theory. In practice, the model has some serious flaws.
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A CPU’s out-of-order backend executes operations as their inputs become ready, letting the core keep its execution units fed while waiting for long latency instructions to complete. Different sources give conflicting information about Cortex X925’s reordering window. Android Authority claims 750 MOPs. Wikichip believes it’s 768 instructions, based off an Arm slide that states Cortex X925 doubled reordering capacity over Cortex X4. Testing shows X925 can keep 948 NOPs in flight, which doesn’t correspond with either figure unless NOP fusion only worked some of the time.
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If the transform's transform() operation is synchronous and always enqueues output immediately, it never signals backpressure back to the writable side even when the downstream consumer is slow. This is a consequence of the spec design that many developers completely overlook. In browsers, where there's only a single user and typically only a small number of stream pipelines active at any given time, this type of foot gun is often of no consequence, but it has a major impact on server-side or edge performance in runtimes that serve thousands of concurrent requests.