Content

Introduction

(back to course plan)

Why should we optimize websites?

Improve user experience
Improve page ranking (SEO)
Mobile compliance
UI logic is shifting to the front-end ⇒ increasing complexity

Some figures:

94.4% of web sites use JavaScript (as of 2016-Dec)
users abandon a web site after 2s of waiting
90% of the waiting time is spent after the HTML has been retrieved
80% of the waiting time is spent in the front-end

Scope

"Transport" section:

all kinds of web apps

"CPU" and "Memory" sections:

Web apps with browser side logic
- traditional (eg JSF) with "smart" components, AJAX…
- SPA (Single Page Apps)
i.e. applications relying heavily on JavaScript

Out-of-scope:

animations, games…

Exercises

Exercises will be based on:

the Chrome browser,
Blink(WebKit) rendering engine,
V8 JavaScript engine.

Disclaimer

We’re still learning
Landscape evoluates extremely rapidly
Optimizing a web app is more an art than a science

That’s all folks!