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©2018 AKAMAI
Common Traits of High
Performing Websites
Paul Calvano
Principal Web Performance Architect
pacalvan@akamai.com
©2018 AKAMAI
Agenda
● Measuring web performance
● Correlation of best practices to performance
● Recommendations
©2018 AKAMAI
Where do WebPerf best practices come from?
©2018 AKAMAI
Where do WebPerf best practices come from?
©2018 AKAMAI
©2018 AKAMAI
What do we mean by fast vs slow?
Are users impacted by Front-End or Hardware Issues?
Do all browsers get a fast experience?
Are we sending too much content?
Are we serving it in the most performant way?
Is the backend having trouble keeping up with traffic?
©2018 AKAMAI
… And how do we measure it?
●TLSConnectTimeBackend Time Frontend Time
●BasePageTime
●TimetoFirstByte
●DNSTime
●TCPConnectTime
●TimetoVisuallyReady
●StartRender/First
Paint
●FirstContentfulPaint
●LoadTime(onLoad)
●TimetoInteractive
●FullyLoadedTime
●TimetoFirstInteraction
●FirstInputDelay
©2018 AKAMAI
Backend vs Frontend time
Source: Akamai mPulse, July 2018
©2018 AKAMAI
Data Sources
Google BigQuery
©2018 AKAMAI
©2018 AKAMAI
Source: HTTP Archive + CrUX, July 2018
https://paulcalvano.com/index.php/2018/07/02/impact-of-page-weight-on-load-time/
©2018 AKAMAI
Source: HTTP Archive + CrUX, July 2018
https://paulcalvano.com/index.php/2018/07/02/impact-of-page-weight-on-load-time/
©2018 AKAMAI
Image Bloat
Source: HTTP Archive, October 2018
©2018 AKAMAI
What does Lighthouse tell us about images?
Lighthouse estimates byte savings are based on JPEG quality 85
Greater savings are achievable w/ perceptual quality compression techniques + browser specific formats
Source: Lighthouse via HTTP Archive, October 2018
©2018 AKAMAI
Source: HTTP Archive, October 2018
©2018 AKAMAI
Source: HTTP Archive, October 2018
https://medium.com/@addyosmani/the-cost-of-javascript-in-2018-7d8950fbb5d4
©2018 AKAMAI
Source:
Akamai mPulse,
October 2018
©2018 AKAMAI
Source:
Akamai mPulse,
October 2018
©2018 AKAMAI
Distribution of mobile traffic by country
Source:
Akamai mPulse,
October 2018
©2018 AKAMAI
Android Device Fragmentation: ~ 12,200 devices!
Source:
Akamai mPulse,
October 2018
©2018 AKAMAI
● LongTasks API - implemented in
Chrome browsers:
○ https://www.w3.org/TR/longtasks/
● Whenever a task takes longer than
50ms it is considered a long task.
● mPulse is collecting the total durations
of all long tasks during a page load.
Source: Akamai mPulse, October 2018
©2018 AKAMAI
What about 3rd parties
Source: HTTP Archive, August 2018
©2018 AKAMAISource: HTTP Archive + CrUX, August 2018
Sites with
more 3rd parties
tend to be slower!
©2018 AKAMAI
How well are we compressing text assets?
Only 48% of HTML responses are compressed.
Source: HTTP Archive, October 2018
©2018 AKAMAIhttps://paulcalvano.com/index.php/2018/07/25/brotli-compression-how-much-will-it-reduce-your-content/
©2018 AKAMAISource: HTTP Archive, October 2018
©2018 AKAMAISource: Akamai mPulse, October 2018
©2018 AKAMAI
Load Time Correlations
Correlation using Pearson Correlation Coefficient
Source: HTTP Archive, October 2018
©2018 AKAMAI
How many requests are in the critical rendering path?
Source:
https://developers.google.com/
web/fundamentals/performance
/critical-rendering-
path/analyzing-crp
Lighthouse via HTTP Archive,
October 2018
3 critical
requests
©2018 AKAMAI
How Many Custom Webfonts Do You Use?
67.7% of websites use at least 1 web font.
26.5% use 5 or more fonts
5% use more than 10 fonts
Source: HTTP Archive and CrUX, October 2018
©2018 AKAMAI
Shared Hosting or Self Hosting of Fonts
50% of all webfonts
Note: Safari keys cache entries by requesting site
21,807 unique
Google Fonts
Source: HTTP Archive, October 2018
©2018 AKAMAI
Conclusions
● The long tail is important - think about your users
○ … and measure their experiences with RUM
● Choose your metrics wisely!
○ Which metric will best evaluate the feature you are testing?
● If you serve less content, your site will be faster.
○ Don’t expect browser caching to save you.
● JavaScript execution time is a significant bottleneck, especially on mobile.
○ Be careful how much code you are sending to users
● Optimize images for devices.
○ Avoid sending high res desktop quality images to mobile devices
● Limit the number of requests in the critical render path
©2018 AKAMAIbit.ly/ha-slack
Chat
github.com/HTTPArchive
Contribute
discuss.httparchive.org
Collaborate HTTP Archive Guided Tour
https://bit.ly/2JmDnSH
34 ©2018 AKAMAI
35 ©2018 AKAMAI
mPulse Answers Key Questions
36 ©2018 AKAMAI
Q&A
pacalvan@akamai.com
@paulcalvano

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