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Jankety Jank
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0
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Jank?
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Aalreet!
means hello
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100ms to 10s
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Frame Budget
1000 / 60 = 16.6ish
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The Rendering Pipeline
Warning - browser internals are around the bend.
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Renderer Process
GPU Process
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Renderer Process
GPU Process
Compositor
Compositor Worker Thread/s
Main Thread
GPU Thread
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Parsing
Converting code to various tree structures
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Tokeniser Parse Tree DOM
Script Exe
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“Scripts at the bottom”
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html
head
meta link
body
p hello world
DOM +
CSSOM
body
font-size: 16px p
display: none
= Render Tree
body
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Layout
Calculate position and size of nodes in tree.
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Batched & Immediate
Browser batches changes.
Certain things force an immediate layout.
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Tread Carefully
Forced sync layout.
Layout thrashing. http://bit.ly/1TbWsmx
Batch operations.
FastDOM
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Paint
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Two Step Process
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Draw Calls
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Rasterization
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Compositing
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Update Layer Tree
Image Decode
Major GC
Evaluate Script
Minor GC
Timer Fired
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Interval
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Continous.
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R.A.I.L
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Example
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Load - 1s
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Idle - 50ms chunks
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Animation - 16.6ms
8ms
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You the compositor
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Reduce Paint Areas
will-change: transform, translateZ(0)
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F.L.I.P
bit.ly/1TJ4VAv
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Response 100ms
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e.preventDefault()
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All weighted equally
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Go Explore
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Go Educate
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Context is key
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Thanks