582 DSTREG - SLCTR TST_SEL_NONSS PTSELE DLY ; test selector (in LCALL delay slot)
You might assume this pattern is inherent to streaming. It isn't. The reader acquisition, the lock management, and the { value, done } protocol are all just design choices, not requirements. They are artifacts of how and when the Web streams spec was written. Async iteration exists precisely to handle sequences that arrive over time, but async iteration did not yet exist when the streams specification was written. The complexity here is pure API overhead, not fundamental necessity.
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Олеся Мицкевич (Редактор отдела «Силовые структуры»)
Photograph: Simon Hill
The irony is that streaming SSR is supposed to improve performance by sending content incrementally. But the overhead of the streams machinery can negate those gains, especially for pages with many small components. Developers sometimes find that buffering the entire response is actually faster than streaming through Web streams — defeating the purpose entirely.