Virtual memory is conceptually simple but potentially devastating to performance. Every memory access must go through segmentation (add segment base, check limit) and then paging (look up the page table). Naively, paging alone requires two additional memory reads per access -- one for the page directory entry, one for the page table entry.
The solution to today's Connections: Sports Edition #521 is...
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Instead of yielding one chunk per iteration, streams yield Uint8Array[] — arrays of chunks. This amortizes the async overhead across multiple chunks, reducing promise creation and microtask latency in hot paths.
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Most of the UK's mackerel fishing is based in Scotland, and the industry there has responded to Waitrose's move with dismay.