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ASSET REDUX London Web — August 2014

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Phil Nash @philnash philnash@twilio.com

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PERFORMANCE & RAILS

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FRONT END PERFORMANCE

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Why front end performance? •  Sites are getting bigger •  More people are going mobile •  I'm a busy person

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Top 1000 sites Month/Year Average page size Average number of requests June/2011 690kB 85 June/2014 1492kB 108 Source: http archive

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Why Rails? •  It's what I know

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Why Rails? But seriously...

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WHY AM I TALKING ABOUT THIS?

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PERFORMANT BY DEFAULT

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TOOLS

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Tools •   WebPageTest •   Google PageSpeed Insights •   YSlow •   Real User Monitoring

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The problems •  Bandwidth •  Latency •  User attention

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Delay User perception 0-100ms Instant 100-300ms Small perceptible delay 300-1000ms Machine is working 1000+ms Likely mental context switch 10000+ms Task is abandoned Source: High performance browser networking

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FAST FRONT ENDS

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WARNING!

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TEXT ASSETS

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CONCATENATE AND MINIFY Thanks asset pipeline!

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CHOOSE WHAT TO CONCATENATE

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GZIP Thanks asset pipeline!

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I <3 ASSET PIPELINE

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nginx l o c a t i o n ~ ^ / ( a s s e t s ) / { r o o t / p a t h / t o / p u b l i c ; g z i p _ s t a t i c o n ; # t o s e r v e p r e - g z i p p e d v e r s i o n e x p i r e s m a x ; a d d _ h e a d e r C a c h e - C o n t r o l p u b l i c ; } Source: RailsGuides 0 1 . 0 2 . 0 3 . 0 4 . 0 5 . 0 6 .

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Heroku •  heroku_rails_deflate •  rack-zippy

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CACHE HEADERS

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nginx l o c a t i o n ~ ^ / ( a s s e t s ) / { r o o t / p a t h / t o / p u b l i c ; g z i p _ s t a t i c o n ; e x p i r e s m a x ; a d d _ h e a d e r C a c h e - C o n t r o l p u b l i c ; } 0 1 . 0 2 . 0 3 . 0 4 . 0 5 . 0 6 .

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Heroku M y A p p : : A p p l i c a t i o n . c o n f i g u r e d o c o n f i g . s e r v e _ s t a t i c _ a s s e t s = t r u e c o n f i g . s t a t i c _ c a c h e _ c o n t r o l = " p u b l i c , m a x - a g e = 3 1 5 3 6 0 0 0 " e n d 0 1 . 0 2 . 0 3 . 0 4 .

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THE DOM AND THE CSSOM

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Source: High performance browser networking

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CSS IN THE HEAD JS AT THE BOTTOM

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TURBOLINKS

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TURBOLINKS

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CSS and the critical path Inline the CSS required for above the fold in the head Load the rest at the bottom Patrick Hamann on CSS and the critical path The Guardian team load CSS from localStorage Critical path CSS generator

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IMAGES

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LOSSLESS COMPRESSION

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Assets Get the asset pipeline to do it! sprockets-image_compressor

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Uploads Plugins! paperclip-optimizer carrierwave-imageoptimizer

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PROGRESSIVE JPEGS

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Source: Book of speed

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Assets Get the asset pipeline to do it! image_optim

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Paperclip h a s _ a t t a c h e d _ f i l e : i m a g e , { : s t y l e s = > { : p r o g r e s s i v e = > ' 1 x 1 < ' } , : c o n v e r t _ o p t i o n s = > { : p r o g r e s s i v e = > ' - i n t e r l a c e P l a n e ' } } 0 1 . 0 2 . 0 3 . 0 4 . 0 5 . 0 6 . 0 7 . 0 8 .

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INLINING

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Inlining rails-sass-images . m a i l a { b a c k g r o u n d - i m a g e : i n l i n e( " s v g / m a i l . s v g " ) ; } 0 1 . 0 2 . 0 3 .

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HTTP 2.0

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SPDY

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HTTP 2.0/SPDY Features •  Single connection - multiplexed streams •  Request prioritization •  Server push

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Fixing for SPDY •  Stop concatenating/inlining

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THANKS

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Questions? @philnash philnash@twilio.com