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Optimizing & Profiling UI Performance
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What does it mean to have performant UI?
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Jank
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Frame Rate (FPS)
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Refresh Rate (Hz)
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1 second (1000ms) / 60 frames = 16.67ms per frame FPS is capped by device display (refresh rate Hz) due to VSync
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VSync
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3 Double Buffering 0 1 2 1 2 CPU GPU Display 1 1 Front Buffer CPU GPU Back Buffer 2 3 3 VSync VSync VSync VSync Frame Drop
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4 3 Triple Buffering 0 1 2 3 1 2 CPU GPU Display 1 1 Front Buffer CPU GPU Back Buffer CPU GPU 3rd Buffer 2 3 4 VSync VSync VSync VSync Frame Drop
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No VSync
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Optimize
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Flatten View Hierarchy
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Deeply Nested View Hierarchy
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Deeply Nested View Hierarchy
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Shallow View Hierarchy
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Deeply Nested Design View Optimized
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Hierarchy Viewer
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3 2 1
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[show deeply nested hierarchy]
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[show shallow hierarchy]
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[show image of obtaining measure, layout and draw time]
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Know your Views
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GPU Overdraw
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clipRect & quickReject
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Performance Profiling
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Profile GPU Rendering
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Marshmallow
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Android Studio Monitors
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android { buildTypes { debug { debuggable true } release { ... } } }
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Systrace
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$ cd android-sdk/platform-tools/systrace $ python systrace.py --time=10 -o mytrace.html sched gfx view wm
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Image Libraries to the Rescue! Picasso
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Thank you Twitter @kenodoggy g+ +BrendaCook_kenodoggy