Devoxx be fast and beautiful images
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This document provides an overview of optimizing images and video for delivery on mobile devices. It discusses four main optimizations for images: quality, format, sizing, and lazy loading. For quality, it recommends using 85% quality for JPEG images. For format, it suggests using formats like WebP, SVG and responsive images. For sizing, it discusses generating responsive image sizes. For lazy loading, it covers techniques to delay loading images until they are visible. For video, it discusses optimizations like preloading, resizing video, removing audio from non-playing videos, and optimizing video delivery through techniques like manifest files and adaptive bitrate streaming.
Devoxx be fast and beautiful images
- 1. Delivering Beautiful and Fast Images and Video Doug Sillars @DougSillars Devoxx Belgium November 15, 2018
- 2. Contact Me: @DougSillars Doug.Sillars@gmail.com www.dougsillars.com Doug Sillars Freelance Developer Relations Performance Audits: Web/Native Workshops: Performance/Images/Video http://bit.ly/HighPerformanceAndroidApps
- 4. 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
- 5. Large Downloads Induce Delays in Rendering 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
- 6. Images & Video make up 75% of Web Content HTTPArchive mobile websites 15/02/18
- 7. 7.9 MB
- 8. 3.5 MB
- 9. 4 Simple Image Optimizations
- 10. 4 Simple Image Optimizations 1. Quality 2. Format 3. Sizing 4. Lazy Loading
- 11. 4 Simple Image Optimizations 1. Quality 2. Format 3. Sizing 4. Lazy Loading
- 12. 4 Simple Image Optimizations Httparchive.org Webpagetest.org
- 13. 4 Simple Image Optimizations 1. Quality 2. Format 3. Sizing 4. Lazy Loading
- 14. Image Quality magick -quality 85 riga.jpg riga85.jpg http://res.cloudinary.com/dougsillars/image/upload/q_85/v1520504964/IMG_20180301_114117_tzasan.jpg Lighthouse: Recommends 85% quality on all images https://developers.google.com/speed/docs/insights/OptimizeImages
- 17. Image Quality Use “In The Wild” 500,000 mobile sites Analyzed 3/15/18
- 18. Image Quality Use “In The Wild” Median Savings (50th percentile): • 2.83 seconds faster page load • 419KB less data
- 23. Automate Quality vs. File Size • Butteraugli • SSIM: Structural SIMilarity https://github.com/technopagan/cjpeg-dssim cjpeg-dssim jpegoptim riga.jpg http://res.cloudinary.com/dougsillars/image/upload/q_auto/v1529005982/IMG_20180614_184507_ssuk1i.jpg
- 26. Results: • Test Load on Motorola G4:
- 27. 4 Simple Image Optimizations 1. Quality 2. Format 3. Sizing 4. Lazy Loading
- 28. Image Formats – Average Size HTTPArchive mobile websites 15/02/18
- 29. Image Formats – Average Size HTTPArchive mobile websites 15/02/18
- 30. 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
- 31. 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
- 32. Scalable Vector Graphics (SVG)
- 33. Scalable Vector Graphics (SVG)
- 34. Scalable Vector Graphics (SVG) https://github.com/google/brotli
- 35. Image Formats – Average Size HTTPArchive mobile websites 15/02/18
- 38. SSIM + WebP 986 KB http://res.cloudinary.com/dougsillars/image/upload/q_auto,f_auto/v1529005982/IMG_20180614_184507_
- 39. File Format: Web <picture> <source width = "100%" type="image/webp" srcset=”riga.webp"> <img width = "100%" src=”riga_cjpeg_dssim.jpg" alt=”Riga, Latvia"> </picture>
- 40. Image Format Use “In The Wild” 500,000 mobile sites Analyzed 3/15/18
- 41. Image Format Use “In The Wild” 500,000 mobile sites Analyzed 3/15/18
- 42. 4 Simple Image Optimizations 1. Quality 2. Format 3. Sizing 4. Lazy Loading
- 43. Image Sizing -
- 44. Image Sizing
- 45. Image Sizing -
- 47. Image Sizing 624 832 12,979,000 pixels 519,000 pixels _________________ - 12,460,000 pixels
- 48. Image Sizing 624 832 12,979,000 pixels 519,000 pixels _________________ - 12,460,000 pixels
- 50. Image Sizing - Responsive Images: Generate a set of images 25 KB difference in size
- 51. Responsive Images 624 832 625,000 pixels - 106,000 pixels 519,000 pixels _________________
- 55. Responsive Images Use “In The Wild” 500,000 mobile sites Analyzed 3/15/18
- 56. Responsive Images Use “In The Wild” 442,000 mobile sites Analyzed 3/15/18
- 57. 4 Simple Image Optimizations 1. Quality 2. Format 3. Sizing 4. Lazy Loading
- 60. Lazy Loading Use “In The Wild” 442,000 mobile sites Analyzed 3/15/18
- 61. Lazy Loading Use “In The Wild” 442,000 mobile sites Analyzed 3/15/18
- 62. Preview Images
- 63. Optimizing Content Delivery Preview Images https://github.com/technopagan/sqip
- 68. Animated GIFs
- 69. Animated GIFs Animated GIF 3.8 MB 270% larger
- 70. Animated GIFs
- 71. Animated GIFs MP4: 256 colors 247KB 93% smaller
- 72. 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/
- 73. Animated GIFs
- 74. Video
- 75. 75 Video Buffer Rage: a state of uncontrollable fury or violent anger induced by delayed or interrupted streaming video content http://www.ineoquest.com/press-releases/new-research-reveals-buffer-rage-as-techs-newest-epidemic
- 76. Video Quality Metrics 1.Does the Video Start? 2.Does the Video Stall? 3.Does it Look Good?
- 78. Video Startup Conviva creen_Streaming_TV_Census_Report_FINAL.pdf Q1 2018: Video Startup 16.9B total Video plays 400M Fail to Start 2B Abandoned before Start ~800M hours of video playback lost
- 79. Video Startup Conviva creen_Streaming_TV_Census_Report_FINAL.pdf Q1 2018: Video Startup 16.9B total Video plays 400M Fail to Start 2B Abandoned before Start ~800M hours of video playback lost
- 80. Video Fails To Start
- 82. Video Startup Conviva creen_Streaming_TV_Census_Report_FINAL.pdf Q1 2018: Video Startup 16.9B total Video plays 400M Fail to Start 2B Abandoned before Start
- 83. Video Startup Delay After 2 seconds, every additional second corresponds to 5.8% increase in abandonment https://www.akamai.com/kr/ko/multimedia/documents/technical-publication/video-stream-quality-impacts-viewer-behavior-inferring-causality-using-quasi-experimental-designs-technical-publication.pdf
- 85. Preload When It Makes Sense Ad Playback Video Download
- 86. Preload When It Makes Sense Ad Playback Video Download
- 87. Preload When It Makes Sense Ad Playback Video Download
- 88. ..be Careful with Video Preload Preload = “auto”
- 89. …be Careful with Preload
- 90. Background Video
- 91. Video Background Video (as Downloaded): 5.3 MB Video 5 MB Audio 250 KB 5% of file Best Practice: To save bandwidth, remove the audio stream from videos that are played silently.
- 92. Video Background: Mobile Best Practice: If Viewport will not support Video… Don’t Download it
- 93. Video Background
- 94. Video Background 33.6 MB 27s 2560 x 1226 10 MBPS
- 95. Video Background Best Practice: Resize Video to reasonable size. 33.6 MB 27s 2560 x 1226 10 MBPS
- 96. Video Background Best Practice: Resize Video to reasonable size. PROTIP: Renaming the file is not enough…
- 97. Video Resizing • 1920x1080: 8.1 MB • 1280x720: 4.3 MB • 1080x608: 3.3 MB • 720x405: 1.76 MB http://res.cloudinary.com/dougsillars/video/upload/vc_auto,w_720/v1533591785/depend_p2ryou.mp4
- 100. Video Third Parties
- 101. Video Third Parties
- 102. Video Streaming Manifest File: List of Available Streams Player Chooses a Stream Stream Manifest: List of Video Segments Player Downloads Segments into buffer Video Plays
- 103. Video Plays Optimizing Video Delivery Video Streaming Player can estimate network throughput Optimal video Bitrate HTTPArchive Mobile: 1.6 MBPS Desktop 5 MBPS
- 104. Video Streaming: Manifest File https://hls.ted.com/talks/2208.m3u8 Video Tracks Video Tracks (iFrames) Audio Tracks & Subtitles
- 105. Video Streaming: Manifest File https://hls.ted.com/talks/2208.m3u8 Video Tracks
- 106. Video Streaming: Manifest File https://hls.ted.com/talks/2208.m3u8
- 107. Optimizing Video Delivery Video Streaming Manifest File: List of Available Streams Player selects high bitrate stream Stream Manifest: List of Video Segments Buffer takes a long time to fill Video Does Not Play Player chooses low bitrate Buffer Fills Quickly Video Plays
- 108. Video Startup Conviva creen_Streaming_TV_Census_Report_FINAL.pdf Q1 2018: Video Startup Average Video Start Time: N. America: 4.91s Asia: 3.00s Europe: 4.30s
- 109. Video Streaming: Startup Time Low -> High High => Low Middle (Goldilocks)
- 110. Video Startup 10s 11s 12s 13s 14s 15s 16s 17s 4k Low->High: 4K Middle (Goldilocks): 4k:High->Low:
- 111. Video Startup 4k Low->High: 4K Middle (Goldilocks): 4k:High->Low: PROs: CONS: Fast Startup Initial Quality: Low Other Connections: Initial Quality: Low Very slow startup Fast Connections: Initial Quality: High Initial Quality: Good Initial Startup: Not fast, but not slow
- 112. Video Streaming: Manifest File https://hls.ted.com/talks/2208.m3u8 Testing with WebPageTest 3G
- 113. Video Streaming: Manifest File https://hls.ted.com/talks/2208.m3u8
- 114. Video Streaming: Manifest File https://hls.ted.com/talks/2208.m3u8
- 115. Video Streaming: Manifest File https://hls.ted.com/talks/2208.m3u8 Testing with WebPageTest 3G
- 116. Video Streaming: Manifest File 600k.m3u8
- 117. Video Streaming: Manifest File 600k.m3u8
- 118. Video Streaming: Manifest File https://hls.ted.com/talks/2208.m3u8
- 119. Conclusion Optimize Image: Quality Format Sizing Lazy Load if Possible Only download Video when displayed Strip audio if silent Resize Videos for Mobile Audit 3rd Party Videos Streaming: Start with lower bitrates to speed video playback Streaming: Conservative bitrates *may* reduce stalls, but will lower quality Images Video
- 120. 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
- 121. Conclusion Images and Video Can Be Beautiful AND Fast
Editor's Notes
- #25: 47% smaller!
- #31: 1149 bytes, 700 Zipped
- #32: 1149 bytes, 700 Zipped
- #33: 1149 bytes, 700 Zipped
- #34: 1149 bytes, 700 Zipped
- #35: 1149 bytes, 700 Zipped
- #39: 47% smaller! Or 65% smaller from original!
- #64: file:///Users/demo/Documents/reponsiveimages.html
- #91: www.kidzania.com
- #92: www.kidzania.com
- #93: www.kidzania.com
- #94: www.depend.com
- #95: www.depend.com
- #96: www.depend.com
- #97: www.depend.com