Lowest Base price feed head lag

Mobula currently leads Base head lag at 0.7 s (p50, 24h) across the 3 measured providers. Base targets a 2 s sequencer cadence on the OP Stack, so the chain itself sets a roughly 2 s floor below which no provider can publish: any latency you see beyond that floor is pipeline work (indexer, fan-out, edge). Measured by holding archive-node `eth_subscribe("newHeads")` and timestamping each provider's emission of the same swap event from us-east, eu-west and Singapore.