Web Performance

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HTTP doesn't have multiplexing

HTTP Pipelining/Response Queuing - Head of line blocking - problem

TCP Slow Start

TCP Initial Congestion Window being increased

6 connections per host

HTTP Request Life

Content Download

Compressing

HTTP Request

Can we make the server respond faster?

Socket Connect

Bound by latency and not bandwidth , Can we make ther servers closer using CDN or Geo=positional servers

DNS Lookup

Benchmark ISP DNS Provider

Benchmark Site DNS provider

Stay under 250 ms to feel fast - Usability Engineering

Correlate business metrics to performance

HTTP 2.0 Coming up

Compress Headers...

Higher TCP Window size

Requests are multiplexed/prioritized

Bound by latency and not bandwidth if you are at a decent bandwidth

Lay shorter cables

Latency bound by speed of light

Image optimization - Jpeg over png

Treat speed as a feature - part of design from start

latency impact

ShopZilla improved page load time - 25% more hits

Web Search Delay Experiment - Google And Bing

User gets used to slow response - an interesting observation

Revenue/user dropped

Avg Search Queries decreased

Site Speed Is a factor in Google Search

The slower the page , the higher the Bounce rate