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Waku's Lightpush protocol filters relay traffic at each hop, cutting bytes on sparse topics but adding CPU cost and misconfiguration risk. Here is how it works and how to measure it locally.
Waku's topic-based subscription filter uses GossipSub's scored peer swarm to forward only matching messages, cutting bandwidth for mobile wallets and light clients. Exact-match filtering keeps evaluation O(1) but requires deliberate topic design.
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