Web Performance

Plus de détails

Acoustics

par Alexander Refsum Jensenius

Structural Stregnth and Stability

par Gracie Paolo

Web site development constraints

par Jarnan Kang

structure

par ALVARO HERNANDEZ ADAMUZ

Web Performance

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