Performance Tuning Web Apps - The Need For Speed

The NEED FOR SPEED on WEB!
Vijay Rayapati
Product@GizaPage
@amnigos

Note : Do follow barcamp Rules!

Performance Tuning Your Web Apps
Why SPEED matters?

The most impatient creature on the earth 

RecentlyFred Wilson spoke about

RecentlyFred Wilson spoke about
And the first GOLDEN rule is SPEED

If VC’s are talking about WEB apps SPEED
that means the problem is mainstream

What SPEED means for WEB?
Facebook created PHP HipHop to speedup=F****ing 50% savings!
Web would have been a great place if everything worked like a Google Instant
Lot’s of bad PR and Loose users!
Tip : Do join us at Facebook Developer Garage Bangalore on 24th, September for indepth discussion on HipHop.

But Why You Should Worry?
because
It is about User Experience and Engagement
Slow = High Bounce Rates = No users
Average users are mostly likely to quit a slow page than geeks
It affects your SEO – think Google Instant
but IRCTC still works in India 

AND…
Only DOGS can sleep while pages are loading 

AND…
When was the last time you were waiting for the page to load without cursing it?

What’s a Good Page Speed?
F**K this Page
10 seconds
SPEEED is not a feature, it’s a KILLER!
5 seconds
2.5 seconds
Google loads in 823 milliseconds*
* : Yotta report

God once said SPEED first EVERYTHING next
* : Whom should I quote here? 

Lot’s of sites suck on the WEB!

And it’s sick to use so many lousy pages

Hey
Talk is cheap…Show me the code…

Murphy's Law is usually more applicable than Moore's Law
Premature optimization is the root cause of all evils - Knuth

What Should I Do to SPEED UP?
Lets optimize JAVA/.NET/PHP CODE = FUCK it
I think APACHE is better than IIS = FUCK it
Lets get Intel XYZ7 processor = FUCK it
Lets move to Cloud = FUCK It

The 80-20 Rule
Let’s not worry much
Problem is HERE
To Speed Up
To Scale Up

What Browsers do?
Note : From big brother MS IE Blog!

The Birth and Death of a Page
Note : Thanks to Steven Stefanov for this beauty

Note : From big brother MS IE Blog!

And the browser woes…
Number of connections per host = every browser does it’s own way!
Maximum numberof connections from browser.
JavaScriptengines suck!
So many cool effects – I need more JAVASCRIPT
HTTP was built in B.C and we need SPEEDY!
Enough SHIT lets get to the POINT >>

Good news – lot’s of tools
Page Speed
Speed Tracer
Y slow
Firebug
Webpage SpeedTest
Dynatrace Ajax
and
many more are there!

The Golden Rules
1. Do LESS : Reduce HTTP requests – combine JS files, CSS files, Use Image Sprites
2. Do SMALL : Smush.it/PNG Crush Images, Minify JS/CSS, Remove fugly code
3. Do COOL : Cache JS/CSS/Images, Google “optimize” options for your server 
4. Do MORE : Parallel connections, Order your stuff, Unblock JS & Use Google ajax libs
5. Do GEEKY : XHR use JSON, Flush() early, Gzip, Dump Etags, Cache on Server & CDN
6. Do SMART: Lazy load, Upgrade your JS libs, Cleanup JS files & Get of rid of
comments/code – the EVIL
Tell me other 4 rules 

Thumb Rulesfor 90%
Use Google Closure Compiler – easiest way to optimize your JS.
Play with Cuzillionto learn how to order Images, inline/external Javascripts/CSS
Upgrade your jQuery/others libs regularly – faster and less memory
Do basic optimization of your JS code, just google – ton of resources

Thumb Rulesfor 90%
Don’t put JS libraries on your server unless required – Use Google or MS public CDN’s
Burst the Cache on updates – use ? or include versioning in build script
Use SpritesMeand learn image sprites – saves you a ton of load.
Lazy load/Pre-fetch if have too much stuff after page load or anticipate next page –
XHR, JSON : Love jQuery

If you have just wordpress
Try one of those cache plug-ins like w3-total-cache

Why you should focus on ordering your stuff?

Increase Parallel Downloads
Note : Too many hosts will end up with DNS look up overhead

How to do Async JS loading?
RequireJS– Awesome way to load JS async and also handle dependencies

How to Measure Ajax actions?
Dynatrace Ajax – If John Resig is impressed then you should also be 

How to Measure Ajax actions?
Chrome Speed Tracer – This is a kick-ass 

Geeky: How to do JS payload split?
Why load all the JS code upfront when you only need some of it?
Doloto - http://msdn.microsoft.com/en-us/devlabs/ee423534.aspx

Word of caution
A/B and Multivariate scripts will have impact on performance
Choose user screen captures tools carefully – can get really sluggish
Get rid of asp.net ajax libs, bloated and lousy!
Choose your social or JS framework plug-ins carefully – most are lousy!
and
Look at your server logs – gives you ton of data on requests/responses
Do backend profiling – if you have high loads on the system

When NOT to optimize?

The Future looks brighter!
Web workers – run multiple JS threads!
Hardware acceleration in Browsers – faster rendering/scaling/layouts
The awesome HTML 5 – Async/Defer, local storage/app cache, Web SQL & more!
Expect better JS engines – run highly optimized and native vm code
May be SPEEDY/Web Resource Bundles Soon!

Hope All Browsers will have auto update, love you Chrome!
Can we do something for IE 6? – the death funerals haven’t worked yet 

Follow Leaders
The Yahoo Developer Network Performance Section
Google Performance Engineering Site
Steve Souders((@souders)
Facebook Engineering Blog
Performance Planet
John Resig
High Scalability
InfoQ
Nicole Sullivan(@stubbornella)
Phillip Tellis((@bluesmoon))

Let’s make WEB faster!
May god bless the speed
Vijay Rayapati
Product@GizaPage
@amnigos

Few last things
Thanks to friends at
#BCB9 Sponsorship!

Credits
It’s due wherever I used images from Flickr CC, FindIcons.com and Google Images Search 
Thanks to Pallav (FusionCharts ) for the background theme.

http://smm-strategist.com	66
http://www.linkedin.com	6
http://web.archive.org	2
https://si0.twimg.com	1

Performance Tuning Web Apps - The Need For Speed

by Vijay Rayapati

Accessibility

Categories

Upload Details

Usage Rights

4 Embeds 75

Statistics

Performance Tuning Web Apps - The Need For Speed Presentation Transcript