Make Your Views Fast by Evadne Wu

• rendering pipeline

• layer tree(your code) vs presentation tree => pass to render tree

• blending vs compositing

view 疊太深 => draw into your own buffer <=> against animation

rendering time

CoreGraphics > UIView > CALayer

• 3 Instagram secrects

Do things secretly and unseen.

Different kinds of work

Time X Disposable

Creation is costly

retain not copy.

tools

• instruments

1. core animation instrument (overdraw, misaligned, copied images)
2. Allocations Instrument
3. Threads Instrument

• Reveal http://revealapp.com/