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Ilya Grigorik has written another wonderful article lavishly detailing the extraordinary tactics Chrome employs to hide network latency from users: Chrome Networking: DNS Prefetch & TCP Preconnect. Ilya springs some surpising factoids on us, revealing how the web has slowed and super sized:
- The size of an average page has grown to 1059kB and is now composed of over 80 subresource requests.
- An average DNS lookup takes between 60 and 120ms. This creates a 100-200ms of latency before a request can be sent because of th full round-trip (RTT) to perform the TCP handshake.
- Slow mobile experiences are largely due to the much higher RTT's (200-1000ms) on wireless networks. Reducing the number of outbound connections and the total byte size of your pages is the single best optimization you can make for mobile today.
Chrome reduces apparent latency using a host of clever anticipatory mechanisms:
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