Chris Mountford:高性能Web前端的打造和测试.pdf
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1、Chris Mountford Atlassian atlassian atlassiandev chromosundrift Front End Performance 1 2 3 Outline Atlassian JavaScript Engineering Performance Factors JIRA Performance Tests Optimisation Perception Traps Summary 4 5 5 6 6 7 7 8 Always Hiring! 8 What is it ? Browser Performance Testing 9 Measuring
2、how fast the web application feels for a single user Browser Performance Testing 10 Browser Performance Testing Measuring how fast the web application feels for a single user 11 12 1995 2013 12 13 “Why do we split everything into so many files?” “Performance.” 14 “Why do we merge all the files into
3、large batches?” “Performance.” 15 If we have data, lets look at data. If all we have are opinions, lets go with mine. - Jim Barksdale (CEO Netscape) “ ” 16 What Causes Slow Browser Performance? 17 Mobile Web All problems are the same but worse: network: radio power mode steps, sleep cpu: battery imp
4、act memory standards compliance development tools 18 Network Time 19 Parse Time 20 CSS Rendering Selector Speed Cascading Right to Left IDs are fast Browser diferences Hardware Acceleration 1. ID, e.g. #header 2. Class, e.g. .promo 3. Type, e.g. div 4. Adjacent sibling, e.g. h2 + p 5. Child, e.g. li
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