Urs Holzle from google on “Speed Matters”
From Urs’ talk at the velocity2010 conference [ More info : Google, datacenterknowledge ]
- Average web page – 320kb, 44 resources, 7 dns lookups, doesn’t compress 3rd of its content
- Aiming for 100ms page load times for chrome
- Chrome: HTML5, V8 JS engine, DNS prefetching, VP8 codec, opensource, spurs competition
- TCP improvements
- Fast start (higher initial congestion window)
- Quick loss recovery (lower retransmit timeouts)
- Makes Google products 12% faster
- No handshake delay (app payload in SYN packets) [ Didn’t know this was possible !!! ]
- DNS improvements
- Propagate client IP in DNS requests (to allow servers to better map users to the closest servers)
- SSL improvements
- False start (reduce 1 round trip from handshake)
- 10% faster (for Android implementation)
- Snap start (zero round trip handshakes, resumes)
- OCSP stapling (avoid inline roundtrips)
- False start (reduce 1 round trip from handshake)
- HTTP improvements (SPDY):
- Header compression
- Stream multiplexing and prioritization
- Server push/hints
- 25% faster
- Test done
- Download the same “top 25” pages via HTTP and SPDY, network simulates a 2Mbps DSL link, 0% packet loss – Number of packets dropped by 40%
- On low bandwidth links, headers are surprisingly costly. Can add 1 second of latency.
- Public DNS:
- reduces recursive resolve time by continuously refreshing cache
- Increases availability through adequate provisioning
- Broadband pilot testing going on
- Fix the “last mile” complaint
- Huge increase of 100x
- More developer tools by Google
- Page speed, speed tracer, closure compiler, Auto spriter
- More awareness about performance
- Web search ranking – speed impacts ranking
- http://code.google.com/speed
- Browserscope
- site performance
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