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On ESP8266 and RP2040, MDNS.update() is called every loop iteration (~120 Hz) but only manages timer-driven probe/announce state machines. Incoming mDNS packets are handled independently via the lwIP onRx UDP callback and are unaffected by update() frequency. The shortest internal timer is the 250ms probe interval (RFC 6762). Throttling to 50ms provides sufficient resolution while reducing CPU overhead by ~84% (from ~360ms to ~60ms per 60s measurement period).
