Benchmark

Demo about UIImage New API in iOS 15

Env

MacBook Air (M1, 2020) 16 GB

Xcode Version 13.0 beta (13A5155e)

Result

Runing on Simulator(iOS 15)

Display

	cat.jpg	underpass.jpg	wave.jpg
preparingForDisplay	0.40	0.39	0.50
DrawInRect	0.96	0.92	1.30

Thumbnail

	cat.jpg	underpass.jpg	wave.jpg
preparingThumbnail	0.33	0.32	0.59
DrawInRect(CoreGraphics)	1.00	1.00	1.41
CGImageSourceCreateThumbnailAtIndex(ImageIO)	0.32	0.32	0.57
UIGraphicsImageRenderer(UIKit)	1.27	1.29	1.72

Notice that the new API preparingThumbnail have almost identfical perfromance to ImageIO technique.

Runing on iPhone XR(iOS 15 beta3)

Display

	cat.jpg	underpass.jpg	wave.jpg
preparingForDisplay	0.29	0.16	0.22
DrawInRect	0.57	0.46	0.68

Thumbnail

	cat.jpg	underpass.jpg	wave.jpg
preparingThumbnail	0.16	0.16	0.30
DrawInRect(CoreGraphics)	0.51	0.50	0.73
CGImageSourceCreateThumbnailAtIndex(ImageIO)	0.16	0.16	0.30
UIGraphicsImageRenderer(UIKit)	0.61	0.64	0.83