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Fast and Beautiful Apps:
Optimisations for When
It’s Just Too Slow
Doug Sillars
@DougSillars
QA Fest Kiev
September 21, 2019
Contact Me:
@DougSillars
Doug.Sillars@gmail.com
www.dougsillars.com
Doug Sillars
Freelance Developer Relations
Performance Audits: Web/Native
Workshops:
Performance/Images/Video/ML/AR
http://bit.ly/HighPerformanceAndroidApps
0.5
0.6
0.7
0.8
0.9
Standing in Line Standing on the
edge of a virtual
cliff
Experiencing
Mobile Delays
Solving a Math
Problem
https://www.ericsson.com/res/docs/2016/mobility-report/emr-feb-2016-the-stress-of-steaming-delays.pdf
Stress
What Is Fast?
https://commons.wikimedia.org/wiki/File:Lightning_Pritzerbe_01_(MK).jpg
Fast is a Human Perception
• 100ms:
• 1s:
• 10s:
https://www.nngroup.com/articles/response-times-3-important-limits/
Perceived as instantaneous
Limit for uninterrupted train of thought: Delay is
noticed, but generally accepted
Limit for keeping focus
Fast is a Human Perception
In 1993:
Fast is a Human Perception
• 100ms:
• 1s:
• 10s:
Perceived as instantaneous
Limit for uninterrupted train of thought: Delay is noticed,
but generally accepted
Limit for keeping focus
65ms: ranged from 34-164ms
https://calendar.perfplanet.com/2018/magic-numbers/
Fast is a Human Perception
• 100ms:
• 1s:
• 10s: 3-5s:
Perceived as instantaneous
Limit for uninterrupted train of thought: Delay is noticed,
but generally accepted
Limit for keeping focus
65ms: ranged from 34-164ms
Performance Studies
3s: 53% of Users Abandon Mobile Sites
500ms: 26% Frustration
8% Engagement
100ms: 1% Revenue Walmart & Amazon (Desktop 2001)
4% Mobile Users Throw Their Phones
https://www.doubleclickbygoogle.com/articles/mobile-speed-matters
http://bit.ly/mobileWebStress
http://www.globaldots.com/how-website-speed-affects-conversion-rates/
https://www.mobilejoomla.com/blog/172-responsive-design-vs-server-side-solutions-infographic.html
Profile & Benchmark Where You Are Today
Video Optimizer
developer.att.com/Video-Optimizer
WebPageTest
www.webpagetest.org
Charles Proxy
www.charlesproxy.com
Charles Proxy
Video Optimizer
Video Optimizer
Video Optimizer
WebPageTest
WebPageTest
Profile & Benchmark Where You Are Today
Video Optimizer
developer.att.com/Video-Optimizer
WebPageTest
www.webpagetest.org
Charles Proxy
www.charlesproxy.com
https://pixabay.com/en/office-business-accountant-620822/
https://www.maxpixel.net/Mobile-Cellphone-Hand-View-Mountains-Touchscreen-2590471
https://opensignal.com/reports/2018/02/state-of-lte
Network Coverage Can be Variable
https://pixabay.com/en/office-business-accountant-620822/
Profile & Benchmark Where You Are Today
Standardize your connection
Devices
Your Device is Not Your Customer’s Device
https://deviceatlas.com/blog/targeting-android-devices-sdk-os-version-statistics#screensize
Older Phones are Drastically Slower
Websites load 20-50%
faster Year over year
https://arxiv.org/pdf/1603.02293.pdf
https://www.androidpolice.com/2018/06/29/alcatel-1x-review-android-go-huge-compromise-every-sense-including-price/
Profile & Benchmark Where You Are Today
Pick a mid-low range phone
Profile & Benchmark Where You Are Today
Pick a mid-low range phone
Test on Slower Networks
Is It Fast?
Is It Fast?
Is It Fast?
Set Goals
Rules for Speed
• Deliver Content Quickly
• Faster requests
• More Efficient
• Images and Video are Large Files
App Startup
JSON Headers: Request
App Startup
JSON Headers:Response
HTTP/1.1 200 OK
Date Sun, 28 Oct 2018 09:26:24 GMT
Server Apache
X-Robots-Tag noindex
X-Content-Type-Options nosniff
Access-Control-Expose-Headers X-WP-Total, X-WP-TotalPages
Access-Control-Allow-Headers Authorization, Content-Type
X-WP-Total 5222
X-WP-TotalPages 523
Link ; rel="next"
Allow GET
Keep-Alive timeout=5, max=100
Transfer-Encoding chunked
Content-Type application/json; charset=UTF-8
Connection keep-alive
JSON Headers:Response
HTTP/1.1 200 OK
Date Sun, 28 Oct 2018 09:26:24 GMT
Server Apache
X-Robots-Tag noindex
X-Content-Type-Options nosniff
Access-Control-Expose-Headers X-WP-Total, X-WP-TotalPages
Access-Control-Allow-Headers Authorization, Content-Type
X-WP-Total 5222
X-WP-TotalPages 523
Link ; rel="next"
Allow GET
Keep-Alive timeout=5, max=100
Transfer-Encoding chunked
Content-Type application/json; charset=UTF-8
Connection keep-alive
Content-Encoding:
Cache-Control:
JSON Headers:Response
HTTP/1.1 200 OK
Date Sun, 28 Oct 2018 09:26:24 GMT
Server Apache
X-Robots-Tag noindex
X-Content-Type-Options nosniff
Access-Control-Expose-Headers X-WP-Total, X-WP-TotalPages
Access-Control-Allow-Headers Authorization, Content-Type
X-WP-Total 5222
X-WP-TotalPages 523
Link ; rel="next"
Allow GET
Keep-Alive timeout=5, max=100
Transfer-Encoding chunked
Content-Type application/json; charset=UTF-8
Connection keep-alive
Content-Encoding:
Cache-Control:
App Startup
Content-Encoding
JSON File: 267 KB
Content-Encoding
JSON File: 267 KB
Content-Encoding: gzip
JSON.gz: 42 KB 85% savings
Content-Encoding: br
JSON.br: 30 KB 89% savings
JSON Headers:Response
HTTP/1.1 200 OK
Date Sun, 28 Oct 2018 09:26:24 GMT
Server Apache
X-Robots-Tag noindex
X-Content-Type-Options nosniff
Access-Control-Expose-Headers X-WP-Total, X-WP-TotalPages
Access-Control-Allow-Headers Authorization, Content-Type
X-WP-Total 5222
X-WP-TotalPages 523
Link ; rel="next"
Allow GET
Keep-Alive timeout=5, max=100
Transfer-Encoding chunked
Content-Type application/json; charset=UTF-8
Connection keep-alive
Content-Encoding:
Cache-Control:
Cache- Control
App Startup
Thumbnail Images
Thumbnail Images
Thumbnail
470 KB
http://home.bt.com/news/news-extra/big-thumbs-up-for-trafalgar-squares-new-fourth-plinth-11364101681206
Thumbnail
470 KB
Little Thumbnail
470 KB
3 KB
Little Thumbnail
470 KB
3 KB
99.3%
smaller!!
Image Size
2.23 MB
4608 x 3456
Image Processing
2.3 MB
Image Processing
2.3 MB
16M pixels
Image Processing
2.3 MB
16M pixels 1M
pixels
Image Processing
2.3 MB
16M pixels 1M
pixels
Image Processing
2.3 MB
16M pixels 1M
pixels
Image Processing
1M
pixels
Download (s) Image Decode
(ms)
Desktop 14 78
Moto G4 14.2 218
Alcatel 1X 14.2 820
Optimising Your Images
• Size
• Quality
• Format
• Caching
• Lazy Loading
Optimising Your Images
• Size
• Quality
• Format
• Caching
• Lazy Loading
Image Size
220 KB
1400 x 1050
https://res.cloudinary.com/dougsillars/image/upload/w_1400/v1540978150/IMG_20181028_153301_okeb2b.jpg
Image Size
78 KB
800 x 600
https://res.cloudinary.com/dougsillars/image/upload/w_800/v1540978150/IMG_20181028_1
53301_okeb2b.jpg
What Sizes Are Optimal?
Check Your Analytics. See what screen sizes use your site the most,
and base images on these devices
Responsive Images
Image Processing (correctly sized)
1.5M
pixels
First Load (s) Image Decode
(ms)
Desktop 2.7 26
Moto G4 3.0 73
Alcatel 1X 3.1 123
Optimising Your Images
• Size
• Quality
• Format
• Caching
• Lazy Loading
Image Quality
Lossy compression
Removes pixels from
image losing
resolution
Google
recommends 85%
for web
Image Quality
Lossy compression
Removes pixels from
image losing
resolution
Image Quality
SSIM
Quality adjusted to
limit of human
perception
Image Quality
SSIM
Quality adjusted to
limit of human
perception
Image Quality
180 KB
1400 x 1050
SSIM Quality
https://res.cloudinary.com/dougsillars/image/upload/w_1400,q_auto/v1540978150/IMG_20181028_153301_okeb2b.jpg
Image Quality - SSIM
1.5M
pixels
First Load (s) Image Decode
(ms)
Desktop 2.7 35
Moto G4 2.8 123
Alcatel 1X 2.9 342
Optimising Your Images
• Size
• Quality
• Format
• Caching
• Lazy Loading
Top Image Formats
jpg, 17,047,941
png, 13,126,543
, 11,795,123
gif, 5,053,385
svg, 1,687,541
ico, 1,076,035
php, 644,839 jpeg, 442,705
webp, 159,089
aspx, 150,792
cnt
HTTP Archive 11/2018
Top Image Format Size
HTTP Archive 11/2018
WebP Support
11/03/2018
Image Format
161 KB
1400 x 1050
SSIM Quality
WebP
https://res.cloudinary.com/dougsillars/image/upload/w_1400,q_auto,f_auto/v1540978150/IMG_20181028_153301_okeb2b.j
Image Quality - WebP
1.5M
pixels
First Load (s) Image Decode (ms)
Desktop 2.6 42
Moto G4 2.7 153
Alcatel 1X 2.8 170
Fast and Beautiful:
1.5M
pixels
0
2
4
6
8
10
12
14
16
18
0
500
1000
1500
2000
2500
full resize q_auto webp
Top Image Format Size: SVG
HTTP Archive 11/2018
Scalable Vector Graphics (SVG)
Images drawn as shapes
infinitely scalable
XML - Can be added inline to HTML document
https://gist.github.com/hail2u/2884613?short_path=66a60ff
Scalable Vector Graphics (SVG)
Images drawn as shapes
infinitely scalable
XML - Can be added inline to HTML document
https://gist.github.com/hail2u/2884613?short_path=66a60ff
Optimising Your Images
• Size
• Quality
• Format
• Caching
• Lazy Loading
Scalable Vector Graphics (SVG)
Scalable Vector Graphics (SVG)
Scalable Vector Graphics (SVG)
KB
Original 946
Optimized 1
Scalable Vector Graphics (SVG)
KB
Original 946
Optimized 1
Scalable Vector Graphics (SVG)
KB
Original 946
Optimized 1
GZip 687 bytes
Scalable Vector Graphics (SVG)
KB
Original 946
Optimized 1
GZip 687 bytes
Brotli 525 bytes
Scalable Vector Graphics (SVG)
KB
Original 946
Optimized 1
GZip 687 bytes
Brotli 525 bytes
Scalable Vector Graphics (SVG)
<style >
.svgorange {
filter: invert(.5) sepia(1)
saturate(5) hue-rotate(5deg);
}
</style>
<img class="svgorange" src ="map-
marker-circle.svg">
https://medium.com/@union_io/swapping-fill-color-on-image-tag-svgs-using-css-filters-fa4818bf7ec6
Scalable Vector Graphics (SVG)
Caching
Caching
Caching
768 x 558
61 KB
768 x 480
31 KB
Optimising Your Images
• Size
• Quality
• Format
• Caching
• Lazy Loading
Lazy Loading
Lazy Loading
Lazy Loading: Experiments
Lazy Loading: Experiments
Optimising Your Images
• Size
• Quality
• Format
• Caching
• Lazy Loading – SVG Previews
Preview Images
Lazy Loading: Experiments
Optimizing Content Delivery
Preview Images
https://github.com/technopagan/sqip
Animated GIFs
Original MP4
1.4 MB
Animated GIFs
Animated GIFs
Animated GIF
3.8 MB
270% larger
Animated GIFs
Animated GIFs
MP4: 256 colors
247KB
93% smaller
Animated GIFs
Video Tags:
<video loop autoplay muted playsinline controls = "false” src="goats.mp4”/>
Video is not pre-loaded, will be last to download
Img tags are fast!
<picture>
<source type="video/mp4" srcset=”goats.mp4">
<source type="image/webp" srcset=”goats.webp">
<img src=”goats.gif">
</picture>
https://calendar.perfplanet.com/2017/animated-gif-without-the-gif/
Animated GIFs
Security – Leaking info to 3rd parties
• https://medium.com/free-code-camp/local-sheriff-watching-them-watching-us-
5eacf3eb00ca
Are your URLs to 3rd parties leaking PII?
Security – Leaking info to 3rd parties
• https://medium.com/free-code-camp/local-sheriff-watching-them-watching-us-
5eacf3eb00ca
Are your URLs to 3rd parties leaking PII?
Addendum: What Are Your Customers Saying?
Addendum: Lite Mode: Save-Data
Save-Data: on
Addendum: Lite Mode: Save-Data
Addendum: Save-Data
Addendum: Save-Data
Addendum: Save-Data
Addendum: Save-Data
q_auto -> q_auto:eco
180KB -> 135 KB
https://res.cloudinary.com/dougsillars/image/upload/w_1400,q_auto/v1540978150/IMG_20181028_153301_okeb2b.jpg
Addendum 2: Network Info
Addendum 2: Network Info
// Network type that browser uses
navigator.connection.type;
// Effective bandwidth estimate
navigator.connection.downlink
// Effective round-trip time estimate
navigator.connection.rtt
// Upper bound on the downlink speed of the first network hop
navigator.connection.downlinkMax
Addendum 2: Network Info
// Network type that browser uses
navigator.connection.type;
// Effective bandwidth estimate
navigator.connection.downlink
// Effective round-trip time estimate
navigator.connection.rtt
// Upper bound on the downlink speed of the first network hop
navigator.connection.downlinkMax
500 KBPS
Be Vigilant!
Continue Testing For Performance
Summary
Testing:
WebPageTest https://www.webpagetest.org
HttpArchive https://httparchive.org
Images:
ImageMagick https://www.imagemagick.org
SSIM https://github.com/technopagan/cjpeg-dssim
LazySizes https://github.com/aFarkas/lazysizes
Responsive Breakpoints http://www.responsivebreakpoints.com/
Cloudinary https://www.cloudinary.com
Tooling
Conclusion
Images Can Be Beautiful AND Fast
Love Building with Video and Images?
Media Developer Expert
mde-comm@cloudinary.com
Become a

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QA Fest 2019. Doug Sillars. It's just too Slow: Testing Mobile application performance

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