Getting Started with Performance Budgets at HighEdWeb Technical Academy, 2015

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GETTING STARTED WITH PERFORMANCE BUDGETS HighEdWeb Technical Academy, 10/04/15 Tim Kadlec | @tkadlec

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MINIMIZE JS & CSS OPTIMIZE IMAGES GZIP JS AT BOTTOM ASYNC SCRIPTS AVOID REDIRECTS

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Weight: +44% onLoad: +46% Requests: +21% Speed Index: +34%

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performance is a CULTURAL ISSUE

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lack of PERFORMANCE lack of PLANNING =

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“I doubt anyone really wants to release a site that doesn't perform well, it's just a product of not being afforded the luxury of time and top-down pressure.” A friend

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BEAUTIFUL ROBUST FAST

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BEAUTIFUL DONE ON TIME

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is the root of all evil PRE-OPTIMIZATION

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is the root of all evil POST-OPTIMIZATION

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http://ﬂic.kr/p/5pp76g

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http://ﬂic.kr/p/9roSGx Hint: This is not juice

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Only a problem if it’s broken

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100ms 1% revenue

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400ms 9% traﬃc

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2.2s 15.4% conversions

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12% bounce rate 160kb

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500ms 25% searches

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GZip 43% bandwidth bill

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overall traffic revenue engagement page views customer satisfaction conversions cost bounce rate

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Performance budget A clearly defined performance goal used to guide design & development

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Four types of metrics 1. Quantity Based 2. Rule Based 3. Milestone Timings 4. Speed Index

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Quantity Based Metrics related to the quantity of requests, bytes, etc of a page

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Easy to understand Clear tie to design/ development decisions Quantity Based

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http://bit.ly/1Jw2jj7

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Quantity Based Easy to understand Clear tie to design/ development decisions Almost no connection to user experience

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Quantity Based

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Rule Based Metrics based on adherence to a set of rules or guidelines

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http://bit.ly/1Vvkg6p

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http:/ /bit.ly/1DQ1eBC http://yslow.org

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Great checklist of basic optimizations Easy to understand Rule Based

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Great checklist of basic optimizations Easy to understand Rule Based Almost no connection to user experience

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Weight: +44% onLoad: +46% Requests: +21% Speed Index: +34%

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Weight: +44% onLoad: +46% Requests: +21% Speed Index: +34% Page Speed: +1

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Rule Based Quantity Based

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Milestone Timings Timing of a very specific milestone in the course of loading a page

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Time to First Byte When does the browser receive the first byte of the first response

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Start Render When does stuff start showing up

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Start render

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DOMContentLoaded How long does it take to execute scripts attached to DOMContentLoaded

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DOMContentLoaded

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Document complete When document fires onLoad event

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Document complete

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Fully loaded Nothing more to see here

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Fully loaded

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http://bit.ly/1Boy5ew

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Easy to track Easy to communicate User timing allows for very specific metrics Milestone Timings

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Easy to track Easy to communicate User timing allows for very specific metrics Milestone Timings Limited view of the user experience

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Quantity Based Rule Based Milestone Timings

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Speed Index A representation of the perceived load of a page, from start to finish

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http://bit.ly/1OfQTXF

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Very closely tied to user experience Speed Index

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Very closely tied to user experience Speed Index Difficult to communicate Limited tracking

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Quantity Based Rule Based Milestone Timings Speed Index

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HOW FAST IS FAST ENOUGH?

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AS FAST AS POSSIBLE

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100ms: instantaneous 1000ms: state of flow

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< 1000 Speed Index

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5298

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7990

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https://ﬂic.kr/p/61tcLS

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20% RULE

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YOUR SITE & 10-12 COMPETITORS

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webpagetest.org/getkey.php

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http:/ /bit.ly/1d2ERjH

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[ { "name": "My homepage", "url": "http://timkadlec.com/", "type": "home" }, { "name": "Steve Souders", "url": "https://www.stevesouders.com/", "type": "away" }, { "name": "Filament Group", "url": "http://www.filamentgroup.com/", "type": "away" } ]

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wptmap --mapper odf-spreadsheet --key MY_KEY --count 3

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http:/ /bit.ly/1FeKy96

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Andy Davies @andydavies

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visually complete <= 4000ms

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Performance budget A clearly defined performance goal used to guide design & development

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Quantity Based Rule Based Milestone Timings Speed Index

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http:/ /bit.ly/15A74dw

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96 KB/S

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http:/ /bit.ly/1qtilDT

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188k 140k

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EMBRACE CONSTRAINTS

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Crying pic

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50 words

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I worried a budget would restrict my vision and suck the life out of any potentially- totally-awesome ideas I may have had. — Katie Kovalcin http://bit.ly/1QSgT8o

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But, as us designers do, I learned to love the challenge of solving a problem within a set of strict parameters. — Katie Kovalcin http://bit.ly/1QSgT8o

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http:/ /bit.ly/1blfVCP

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http:/ /bit.ly/1unluV9

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ENFORCE

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http:/ /bit.ly/1QnesMA

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perfbudget: { home: { options: { url: ‘http://stage.mysite.com‘, key: ‘MY_API_KEY’, runs: '3', connectivity: '3G', mobile: '1', budget: { 'visualComplete': '4000' } } } },

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perfbudget: { home: { options: { url: ‘http://stage.mysite.com‘, key: ‘MY_API_KEY’, output: 'wpt-results.json', budget: { 'visualComplete': '4000' } } } },

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perfbudget: { home: { options: { url: ‘http://stage.mysite.com‘, key: 'MY_API_KEY', budget: { 'userTime.CUSTOM_MARK': '1500' } } } }

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perfbudget: { home: { options: { url: ‘http://stage.mysite.com‘, key: 'MY_API_KEY', budget: { 'bytesIn': ‘250’, 'SpeedIndex': ‘1000’, 'visualComplete': ‘1500’ } } } }

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http:/ /bit.ly/1GllSKJ

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http://bit.ly/1sgKKK3

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speedcurve.com

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speedcurve.com http:/ /bit.ly/1OQL6qT

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WHAT HAPPENS AFTER LOAD

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100ms: instantaneous 1000ms: state of flow

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http://livingwithlag.com/

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RESPONSE ANIMATION IDLE LOAD http://bit.ly/1LWvksF

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RESPONSE

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100ms: instantaneous

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LOAD

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1000ms: state of flow

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ANIMATION

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60fps

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60fps

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30fps

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“…engagement collapsed…”

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1000/60 ~= 16

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16ms

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8-10ms

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IDLE

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50ms

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requestIdleCallback

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requestIdleCallback(myNonEssentialWork);

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function myNonEssentialWork (deadline) { while (deadline.timeRemaining() > 0 && tasks.length > 0) doWorkIfNeeded(); if (tasks.length > 0) requestIdleCallback(myNonEssentialWork); }