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3RD PARTY FOOTPRINT
BARBARA BERMES | @BBINTO
A PUBLISHER'S TAKE ON CONTROLLING 3RD PARTY SCRIPTS

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I LIVE IN TORONTO, CANADA

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I LOVE BURRITOS

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I’M PASSIONATE ABOUT WEB PERF

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LET’S GET THIS PARTY STARTED

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–Ben Vinegar, Author of “Third-Party Script”
“In the strictest sense, anything served to the
client that’s provided by an organization that’s
not the website provider is considered to be
third-party”

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TYPES OF 3RD PARTY SCRIPTS
Ads
Tracking and Analytics
Fonts
Social Media
Libraries and Frameworks

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WHAT’S THE #1 USED 3RD SCRIPT?

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STATS FROM BIG QUERY
#WDC14

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31%
34.5%
38%
2011 2013 2014
32%
36%
38%
3rd party content
DISTRIBUTION OF 3RD PARTY SCRIPTS VS. 1ST PARTY
#WDC14

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Advertising
Analytics
Personalization
Marketing
Tag Management
Search
Social Media
0 25 50 75 100
23
45
53
53
62
92
92
Percentage of sites with each third party function present
Source: Intechnica - The impact of third party content on retail web performance

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VISUALIZE THE IMPACT OF
3RD PARTY SCRIPTS

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FOREIGN CONTENT OVERLOAD

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EXAMPLE: WIRED
#WDC14

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BUT WHAT’S THE ISSUE?

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THINGS TO TALK ABOUT TODAY

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THE ISSUES AND NEGATIVE IMPACTS
Performance
Front-end Single Point of Failure (SPOF)
Privacy

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POTENTIAL SOLUTIONS
Safe snippets
Caching and Hosted Libraries
Tools and Initiatives

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PERFORMANCE

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The value you get out of the widget needs to be
greater than the performance hit you are taking
- John Hjelmstad
Google I/O 2012 (How we Make JavaScript Widgets Scream)
RULE OF THUMB

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A user who has to endure an 8-second download delay
spends only 1% of their total viewing time looking at the
featured promotional space on a landing page.
In contrast, a user who receives instantaneous page rendering
spends 20% of viewing time within the promotional area
(source: Jakob Nielsen)
PERCEPTION OF PROMOTIONAL SPACE

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WHAT WOULD A LIFE WITHOUT ADS FEEL LIKE?

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THE PERFORMANCE IMPACT OF ADS
#WDC14

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Using no (client-side) ad
code reduced CBC’s
page load time by 40%
40%
<script/>

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MONITOR FOREIGN CONTENT,
CONSTANTLY!

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ArithmeticMeanins
0
2.5
5
7.5
10
10/4/12 10/31/12
BAD 3RD PARTIES (CBC TOUCH SITE)
Smooth sailing
Client-side Ads
Ads turned off
Server-side Ads
Source: Keynote Daily Reports
We noticed a spike
#WDC14

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SINGLE POINT OF FAILURE

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A single point of failure (SPOF) is a part of a system that, if
it fails, will stop the entire system from working
–Wikipedia

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THE OFFENDER
It will block rendering anything after this line

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YEAH….BUT DO THIRD PARTY PROVIDERS
EVER GO DOWN??

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OH YES. THEY DO!

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THE GREAT FIREWALL OF CHINA

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SIMULATING SPOF ON TECHCRUNCH

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SPOF-O-Matic
#WDC14

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SPOF WIRED
Without SPOF
With SPOF: Visually complete 40s

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LET’S CRASH THE PARTY

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INITIALIZING CLIENT-SIDE SCRIPTS

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ASYNC OR DEFER JS

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ASYNC OR DEFER JS

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SAFEST WAY: DYNAMIC SCRIPT TAG
(to cover most of the browsers)

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ASYNCHRONOUS LOADING
http://www.phpied.com/social-button-bffs/

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ASYNCHRONOUS LOADING

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ASYNCHRONOUS LOADING

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ASYNCHRONOUS LOADING

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ASYNCHRONOUS LOADING

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ASYNCHRONOUS LOADING

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ASYNCHRONOUS LOADING

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BEFORE

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5 seconds 25 seconds

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AFTER

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AFTER
5 seconds

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PREVENTION!
PROTECT YOURSELF WITH THE HELP OF TOOLS

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CACHING?
Don’t always rely on it!

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CACHE POLICIES
30min.
30 min
12 hrs
20 min
1 hr
336 hrs
no cache
1 hr
3 min
#WDC14

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HOSTED LIBRARIES?

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DON’T JUST COPY AND PASTE
#WDC14

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SPOF ALERT

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DON’T DO THIS….

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RATHER DO THIS: SILENTLY FAIL

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Other
55%
1.7.2
14%
1.7.1
13%
1.10.2
9%
1.8.3
9%
GOOGLE’S HOSTED JQUERY FRAGMENTATION
Source: March 2014, Big Query result on jQuery from Google CDNs

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SO, WHATS THE VERDICT:
HOSTED LIBRARIES OR NOT?

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PRIVACY

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“The Like button is the quickest way
for people to share content with their
friends.
A single click on the Like button will
'like' pieces of content on the web
and share them on Facebook.”

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What they don’t tell you….
Track the visited website, your
IP, and more….????
Did you agree to that?
!

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OPEN SOURCE INITIATIVES
AND RESOURCES

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PRIVACY HERO
HEISE’S OPT-IN SOLUTION

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3RD PARTY PERF HEROES
PHILIP TELLIS & STOYAN STEFANOV

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JSMANNERS

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CONTRIBUTE ON GITHUB!
https://github.com/triblondon/thirdpartysla
#WDC14

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NEXT TIME BEFORE YOU COPY AND PASTE

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WHAT TO DO AS A PUBLISHER & DEVELOPER
• Refuse 3rd party content that doesn’t provide async options
• Put the risk in the SLA (uptime etc.)
• Review jsmanners
• Educate other (junior) developers

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• Ask for server-side options
• Evaluate tag managers
• Investigate hosted libraries (if no own CDN is available)
• Monitor, monitor, ….and monitor
WHAT TO DO AS A PUBLISHER & DEVELOPER

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WHAT TO DO AS A SCRIPT PROVIDER
• Provide non-blocking code samples and snippets
• Educate developers and verify the integration of your script developers
(proof-check)

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THE PARTY’S OVER
!
THANK YOU

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QUESTIONS?
http://bit.ly/wdc14-3rdparty