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Upgrading the Web Driving Support For New Standards Boston Web Performance Meetup Jonathan Klein @jonathanklein
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Slides, Links jkle.in/boswebperf
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About Me
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About Me • Performance Engineer At Etsy
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About Me • Performance Engineer At Etsy • I write the Etsy Site Performance Reports
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About Me • Performance Engineer At Etsy • I write the Etsy Site Performance Reports • Started this group
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Things You Learned
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Things You Learned • Origin Hints
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Things You Learned • Origin Hints • Client Hints
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Things You Learned • Origin Hints • Client Hints • WebP
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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What Should I Implement?
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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HTTP Origin Hints
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HTTP Origin Hints • IETF Draft
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HTTP Origin Hints • IETF Draft • HTTP Response Header
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HTTP Origin Hints • IETF Draft • HTTP Response Header • Tells the browser about server capabilities
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HTTP Origin Hints • IETF Draft • HTTP Response Header • Tells the browser about server capabilities •OH: a,b=6,c
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HTTP Origin Hints
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HTTP Origin Hints • Small Request Headers
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HTTP Origin Hints • Small Request Headers • Relative Referers
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HTTP Origin Hints • Small Request Headers • Relative Referers • Omitting Cookies
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HTTP Origin Hints • Small Request Headers • Relative Referers • Omitting Cookies • Sharing Connections
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HTTP Origin Hints • Small Request Headers • Relative Referers • Omitting Cookies • Sharing Connections • Pipeline Depth
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Reduce Header Size
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Optimize Transfer
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No Content Changes
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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Client Hints
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Client Hints • IETF Draft
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Client Hints • IETF Draft • HTTP Request Header
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Client Hints • IETF Draft • HTTP Request Header • Tells the server about browser capabilities
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Client Hints • IETF Draft • HTTP Request Header • Tells the server about browser capabilities •CH-DPR: 2.0
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Will Also Specify Height/Width
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Simplifies Markup
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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WebP
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WebP • New image format from Google
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WebP • New image format from Google • 25-34% smaller than JPEG
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WebP • New image format from Google • 25-34% smaller than JPEG • Lossless Option
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WebP • New image format from Google • 25-34% smaller than JPEG • Lossless Option • Alpha Transparency
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WebP • New image format from Google • 25-34% smaller than JPEG • Lossless Option • Alpha Transparency • Animation
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Now We’re Getting Somewhere...
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Key Stats First Run Bytes 576KB Start Render 932ms Speed Index 1269ms
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Brief Aside: Speed Index
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Convert JPEGs to WebP
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Key Stats First Run WebP Difference Bytes 576KB 387KB -33% Start Render 932ms 1019ms +9% Speed Index 1269ms 1278ms <1%
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Its Future is Uncertain
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Challenges with WebP
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Challenges with WebP • Harder to share
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Challenges with WebP • Harder to share • Increased decoding time
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Challenges with WebP • Harder to share • Increased decoding time • Controversial studies around quality/size
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Challenges with WebP • Harder to share • Increased decoding time • Controversial studies around quality/size • No progressive decoding (yet)
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Still a Big Bandwidth Win
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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SPDY/HTTP 2.0
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SPDY/HTTP 2.0 • Next version of HTTP
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SPDY/HTTP 2.0 • Next version of HTTP • HTTP Multiplexing
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SPDY/HTTP 2.0 • Next version of HTTP • HTTP Multiplexing • Header Compression (HPACK)
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SPDY/HTTP 2.0 • Next version of HTTP • HTTP Multiplexing • Header Compression (HPACK) • Prioritization
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SPDY/HTTP 2.0 • Next version of HTTP • HTTP Multiplexing • Header Compression (HPACK) • Prioritization • Server Push
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Recall Origin Hints…
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Reducing Header Size vs. Header Compression
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No More...
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No More... • Domain Sharding
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No More... • Domain Sharding • Spriting Images
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No More... • Domain Sharding • Spriting Images • Concatenating Files
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No More... • Domain Sharding • Spriting Images • Concatenating Files • DataURIs
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Slides, Links jkle.in/boswebperf
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Let’s See it in Action
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Before SPDY
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After SPDY
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Key Stats First Run SPDY/ HTTP 2.0 Difference Bytes 387KB 387KB - Start Render 1019ms 972ms -5% Speed Index 1278ms 1108ms -14%
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istlsfastyet.com
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Sites Using SPDY Today
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Sites Using SPDY Today • Most (all?) Google Properties
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Sites Using SPDY Today • Most (all?) Google Properties • Facebook
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Sites Using SPDY Today • Most (all?) Google Properties • Facebook • Twitter
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Sites Using SPDY Today • Most (all?) Google Properties • Facebook • Twitter • You?
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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NOT talking about pre-render
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Pre-fetching • Fetch assets for next page • Speeds up navigation
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WebPagetest Script ! logData 0 navigate https://velocity.jkle.in logData 1 navigate https://velocity.jkle.in/product.html
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Key Stats First Run Bytes 85KB Speed Index 479ms CSS Files 2 JS Files 6
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! ! ! ! !
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Key Stats First Run Pre-fetching Difference Bytes 85KB 50KB -40% Speed Index 479ms 290ms -40% CSS Files 2 0 -100% JS Files 6 0 -100%
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Things You Learned • Origin Hints • Client Hints • WebP • SPDY/HTTP 2.0 • Pre-fetching
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Browser Support
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These Are Still Good Options
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Convincing CDNs Would Be HUGE
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Implementation Challenges
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Action Steps
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Action Steps • Implement as much as you can
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Action Steps • Implement as much as you can • Speak/blog about challenges
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Action Steps • Implement as much as you can • Speak/blog about challenges • Ask your CDN for support
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Action Steps • Implement as much as you can • Speak/blog about challenges • Ask your CDN for support • Report bugs
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Let’s Upgrade The Web
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Thanks!
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@jonathanklein ! jonathan@etsy.com ! www.etsy.com/careers Get in Touch