Getting Started With Web Performance by Austin, Daniel -- Read -- Imperial Library of Trantor

Index

Getting Started with Web Performance Preface

Overture: Who Should Read This Book (and Why) Why You Should Read This Book What We’ll Cover What You Need to Know to Get Started How to Read This Book Software Tools

About the Companion Site for This Book Notes on Terminology and References

Themes of the Work Conventions Used in This Book Using Code Examples Safari® Books Online How to Contact Us Acknowledgments

1. What Is Web Performance?

Scope

Performance is Response Time

An Art and a Science

Doing Science Experiments on the Web Beyond Analysis

Systems Thinking: Where Does Performance Fit In?

Systemic Qualities and the Big Picture on Performance Manifest Qualities Developmental Qualities Operational Qualities Evolutionary Qualities

Handling Performance Tradeoffs

How to Manage Tradeoffs in Design

Security v. Performance Budgetability v. Performance Market Velocity v. Performance

How Fast is Fast Enough?

Role of the Human in Performance What do Fast and Slow Really Mean?

Dimensions of Web Performance

The Stochastic Web

The “Contraptionary” Nature of the Web

Factors Affecting Web Response Times

Geography Network Location Bandwidth and Throughput

Connection Type

Direct Connections (LAN) 802.11 Wireless (WiFi) Cellular Networks

Hands-on: Check Your Bandwidth

Task

Using the SpeedTest Tools

What Did We Learn? User Agents

Browsers Mobile Applications as User Agents

Traffic Types on the Web

API Traffic Advertising Streaming Media Traffic

Hands On: Our First Look at Web Response Times

Tasks Gathering Data Generating the Report Plotting the Data What We Learned

2. Introducing the MPPC Model of Web Performance

Model Overview The User Narrative Viewpoint The HTTP Request / Response Cycle

HTTP Requests Response Composition

Loading a Single Object: The Simplest Case

T1 - The Connection Time T2 - The Server Duration T3 - The Network Transport Time T4 - The Client Processing Time

Hands On: A Single-Object Example Working with Multiple Objects

The Multi-step MPPC Request/Response Pattern Step One: Loading the Initial DOM Object What is the DOM? Step Two: Loading Intransitive Page Objects Kinds of Hypertext Links Step Three: Deferred Loading Pitfalls of Deferred Loading What Does MPPC Mean? Summary: MPPC Model Overview

Hands On: Looking at Waterfall Diagrams

Task Tools Running a Test What We Learned

3. T1 - The Connection Time

Introduction to T1 - The Connection Time

Tools Used

DNS: Internet Names and Addresses

How DNS Works DNS and Performance DNS and Global Server Load Balancing Hands-on: The User Impact of DNS Tools Required Performing the Test What We Learned Finding and Solving DNS Performance Problems Optimizing Your DNS Response Times

SYN SYN ACK - Setting Up a TCP Connection

TCP Connections and Response Times Finding and Solving TCP Connection problems Optimizing TCP Connection Times Secular Cycles and Response Times

TLS, SSL, and Secure Connections

TLS, SSL, and All That How TLS Works

HTTP vs. HTTPS The Basic TLS Handshake Hands-On: The TLS Handshake in Action

Task What We Learned

TLS: Certificates & Verification

Certificate Verification Key Length, Security, & Performance Extended Validation

Revocation Checks: OCSP and CRL

OCSP

How Long Does an OCSP Lookup Take? OCSP Caching

CRL What Makes TLS Slow? Optimizing Your TLS Response Times

Early Termination Session Resumption OCSP Stapling Certificate Chain Length

TCP-Level Optimizations

Certificate (and Record) Size TLS Compression TLS False Start A Word on Packet Loss Finding and Fixing TLS-related problems How Much Does TLS Matter for Performance?

Summing Up on T1

About the Author Copyright

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