We explored standard advanced algorithms like Contraction Hierarchies (CH), known for their speed. But they presented their own set of deal-breakers for OsmAnd:
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3. Apply per-script thresholds. Cyrillic confusables at 0.447 mean SSIM require aggressive blocking. Mathematical Alphanumeric Symbols at 0.302 can be handled more permissively, especially since NFKC already collapses most of them. Arabic at 0.205 generates almost no genuine visual confusion and can be deprioritised entirely.
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.，这一点在im钱包官方下载中也有详细论述