deep dive into front end performance
TRANSCRIPT
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Performance Deep Dive
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Profiling
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Show Paint Rectangles
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FPS meter
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Performance Audits
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SmashingMagazine.com99/100 PageSpeed score
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Concepts related to Rendering Performance
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Let’s review a pull requesthttps://github.com/toamitkumar/jschannel2015/pull/10/files
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Critical Rendering Path
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Layout
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width overflow height
padding font-family margin
display vertical-align border-width
border clear top
position bottom font-size
float left text-align
overflow-y right line-height
font-weight white-space min-height
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Painting
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color border-style
visibility background
text-decoration background-image
background-position background-repeat
outline-color outline
outline-style border-radius
background-size box-shadow
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Composting
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What are the different Performance bottlenecks?
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Memory Leaks
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Avoid Forced Synchronous Layouts
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Layout ThrashingForced synchronous layout in quick succession
Demo: Animations example
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How to avoid Layout Thrashing
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Reducing DOM callsConsecutive DOM read/write operations trigger
layout thrashing
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Library: FastDomEliminates layout thrashing by batching DOM
read/write operations,
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Debounce Input Handlers
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Reduce Document Reflows
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Simplify Paint Complexity
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Reduce number of elements styled
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Reduce complexity of CSS selectors
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.box:nth-last-child(-n+1) .title {
/* Slow selector */
}
.final-box-title {
/* Performant implementation */
}
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Reduce Paint Areas
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Avoid Large &
Complex Layout
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GPU Acceleration
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Canvas is hardware accelerated
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Avoid Paint Storms
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How to perform Animation at 60fps ?
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JS Animations
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GIFs and Performance
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PromoteFast performers
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.moving-element {
will-change: transform;
transform: translateZ(0);
}
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So, why not Promote everyone?
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* {
will-change: transform;
transform: translateZ(0);
}
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Apoorv Saxena@apoorv_saxena
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Thank you.