Google sees 15% speed boost with HTTP tweak

Velocity Google is now using its HTTP-boosting SPDY protocol to accelerate almost all SSL web traffic between Chrome browsers and its many web services, and according to Mike Belshe, an engineer on Google's Chrome team, the protocol is juicing performance by more than 15 per cent on average.

"We do not have any property that is not performing better with SPDY than without," Belshe said this afternoon at the O'Reilly Velocity conference in Santa Clara, California.

SPDY quietly made its debut with Chrome 6, and Initially, the protocol was only turned on for a limited percentage of SSL connections to Google services. But Belshe says the company is now using the protocol about 99 per cent of the time. The remaining one per cent, he says, is a necessary control group. "The only way we can measure how it works – the only way we can figure that 15 per cent [speed boost] – is to measure exactly the same usage case," Belshe told us following a conference presentation.

First unveiled as an experimental project in the fall of 2009 , SPDY is an application layer protocol designed to improve the speed of the aging HTTP. The protocol has been available with Chrome since the sixth version of the browser, but at this point, it only kicks into action when the browser is used with Google services and a few other test platforms. At this point, Google services use SPDY exclusively with SSL connections.

Earlier this week, Strangeloop added SPDY to its flagship online service, which websites use to accelerate their load times, and the Israel-based Cotendo has said it will add SPDY to its content delivery network. Cotendo offers services for accelerating both desktop and mobile traffic, but SPDY is not yet available on mobile devices.

Belshe confirmed that the Google Android team is incorporating SPDY into the mobile operating system's browser, and he said that Mozilla is "interested" in using the protocol as well. Google also offers a public SPDY proxy , and there are now SPDY servers written in C++, Python, Go, Ruby, and node.js. The project is open source.

SPDY creates a session between the HTTP application layer and the TCP transport layer, using an HTTP-like request-response setup. It speeds downloads via multiplexed streams, request prioritization, and HTTP header compression. Multiplexing is the main change, Belshe says. With HTTP, you can only handle one request at a time, and though you can open multiple connection, if you open too many, you run into problems with TCP. Multiplexing is hardly a complicated change – "it's been done before, there's no new idea here," Belshe says – but it solves much of the problem.

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Google sees 15% speed boost with HTTP tweak

Belshe confirmed that the Google Android team is incorporating SPDY into the mobile operating system's browser, and he said that Mozilla is "interested" in using the protocol as well. Google also offers a public SPDY proxy, and there are now SPDY



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