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With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.
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The design choices have performance implications. Here are benchmarks from the reference implementation of this possible alternative compared to Web streams (Node.js v24.x, Apple M1 Pro, averaged over 10 runs):，更多细节参见搜狗输入法2026
第六十条 任何国家或者地区在原子能领域对中华人民共和国采取歧视性的禁止、限制或者其他类似措施的，中华人民共和国可以根据实际情况对该国家或者该地区采取相应的措施。