Why should you care?

• If you browse the web
• If you're a developer:
  • On the cutting edge
  • Middle of the pack
  • Late adopters

Overview

• Latency vs. Bandwidth

• Basics of a request

• TCP

• SSL/TLS

• HTTP

  • .9, 1.0, 1.1

  • 2.0

Latency vs. Bandwidth

Speed of Light = c

c = 299,792,458 meters per second

99.7%

125 milliseconds

Anatomy of a Request

Round Trip Counter: 0

DNS

Round Trip Counter: 1

TCP                                               

Round Trip Counter: 2

TCP

TCP TLS                                        

TLS

Round Trip Counter: 4

HTTP

TCP TLS HTTP Data You Wanted

Round Trip Counter: 5

TCP

TCP

SYN

TCP

SYN

ACK

TCP

Congestion

TCP

Congestion

10x

TCP

Congestion

10x

10x

10x

10x

TCP

Congestion

10x

10x

10x

10x

TCP

Congestion Flow

10x 4x

10x 4x

10x 4x

10x 4x

TCP

Window Scaling

20 at a time

TLS

• Encryption
• Authentication
• Integrity

HTTP

.9

HTTP

1.0

HTTP

1.0

Content-Type

ASCII

你好

HTTP

1.0

HTTP

1.0

HTTP

1.1

Optimizations

SPDY

HTTP/2

HTTP/2

HTTP/2

HTTP/2

HTTP/2

HTTP/2

February 2015

Make It Faster

• If Using HTTP 2

  • ​Don’t concat JS/CSS

  • Don’t sprite images

  • Don’t split hosts

• If Using HTTP 1.1

  • Concat JS/CSS

  • Minify JS and CSS

  • gzip JS and CSS

  • Sprite images

  • Split Your Hosts

  • Ensure Keep-Alive is enabled (default for 1.1, but good to be sure)

  • Keep Headers to a minimum - transmitted always

Always

• Transfer Less Data

• Use up-to-date kernels to ensure best TCP performance

• Make sure your TCP and SSL is properly configured

• Properly set up caching of assets

HTTP/2

https://http2rulez.com

People think computers will keep them from making mistakes. They're wrong. With computers you make mistakes faster.
~Adam Osborne

Thanks!

The Noun Project

Annette Vee - Talk Name Generator