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Turbocharge
your mobile web apps

Jan Jongboom
VelocityConf EU 2013
Fast websites are awesome!
blah, blah, blah, caching,
blah, expiration headers, blah, blah,
image maps, blah, blah, combining css,
blah, blah, minifying, blah, blah,
blah
New tricks!
Didn’t even exist when “High Performance Websites” came out
@janjongboom
VelocityConf EU 2013 - Turbocharge your mobile web apps by using offline
37%
VelocityConf EU 2013 - Turbocharge your mobile web apps by using offline
Part 0: Core concepts
1. The shell
2. App content
The shell
• All assets
• Distribution through:
• App store
• Publish on web server
• Changes are costly
The shell
• All assets
• Distribution through:
• App store
• Publish on web server
• Changes are costly
App content
• Everything your app serves up
• Pushed down from server
• Highly volatile
• Changes are cheap
App content
• Everything your app serves up
• Pushed down from server
• Highly volatile
• Changes are cheap
Part I: The shell
Packaging
Packaging
Publishing on the web = awesome
AppCache: a more web’y approach
VelocityConf EU 2013 - Turbocharge your mobile web apps by using offline
VelocityConf EU 2013 - Turbocharge your mobile web apps by using offline
VelocityConf EU 2013 - Turbocharge your mobile web apps by using offline
VelocityConf EU 2013 - Turbocharge your mobile web apps by using offline
example.appcache

Serve as text/cache-manifest
example.appcache

Serve as text/cache-manifest
example.appcache

Serve as text/cache-manifest
How AppCache works
VelocityConf EU 2013 - Turbocharge your mobile web apps by using offline
Shit you will do wrong
• Setting wrong MIME type
• Have one !le 404
• Not realizing user will always see old
version !rst
• Expiration headers on appcache
• Develop with appcache enabled
(tip: set wrong MIME type in dev)
http://comoyo.github.io/ffos-list-detail
Performance metrics

1500 ms
Empty cache
Performance metrics

820 ms
Subsequent reload
Performance metrics

320 ms
Reload with appcache
250% speed bump
Not just for of!ine
Sounds perfect, right?
1. It breaks the web
2. You’re not in control about caching
3. You’re not in control about
of!ine behavior
4. Responsive design is hard
Give developers "ne-grained
control about caching, without
breaking the web
ServiceWorkers
First request

Grabbing jan.com/index.html
ServiceWorkers
First request

Grabbing jan.com/index.html

For foo/* please consult me!
ServiceWorkers
2nd request

I need foo/blah
ServiceWorkers
2nd request

I need foo/blah
ServiceWorkers
2nd request

I need foo/blah

200 OK!
Example: registering
Example: registering
Example: registering
Example: use cache
Example: use cache
Example: use cache
Ongoing work in Gecko / Blink
Spec & playing around
https://github.com/slightlyoff/ServiceWorker
Part II: App content
A simple AJAX request
A simple AJAX request
A simple AJAX request
Naive caching with localStorage
Naive caching with localStorage
Naive caching with localStorage
VelocityConf EU 2013 - Turbocharge your mobile web apps by using offline
VelocityConf EU 2013 - Turbocharge your mobile web apps by using offline
Making it less naive
• Use indexedDB: http://nparashuram.com/IndexedDBShim/
• Wrap around current AJAX lib
• Expiration dates
• Of"ine -> ignore expiration date
Example: AngularJS/indexedDB

https://github.com/comoyo/ffos-list-detail/
blob/master/www/js/services/http-cache.js
Part III: Keeping in sync
Two way syncing is hard!
It all depends
• Operational transform library. F.e. ShareJS
• Objects? F.e. https://github.com/codeparty/racer
• Real deal? PouchDB
Why I like PouchDB
1. It stores data locally, syncs when there is connection
2. Can do syncing client->server, server->client, or both ways
3. Con"ict resolution can be easily programmed out.
Why I like PouchDB
1. It stores data locally, syncs when there is connection
2. Can do syncing client->server, server->client, or both ways
3. Con"ict resolution can be easily programmed out.
4. Dale Harvey is gonna buy me beer
when I show him this slide
Part III: Lessons learned
Lessons learned
Lessons learned
• Of"ine is awesome, speed is awesome!
• Cache shell: packaging, appcache or ServiceWorkers
• Cache content: localStorage, indexedDB, write cache logic that
suits you
• Data syncing: hard, take something off the shelf
Thank you!

slideshare.net/janjongboom
slideshare.net/janjongboom

Questions?
Wanna chat about Firefox OS; Of!ine; Mobile
landscape; What beer you should buy Dutch
speakers; etc.?
Of"ce hours with me at 14:45 (Table 3)

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