4. Agenda
• UIImageView vs Metal
→ GPU
1. UIKit is optimized well with GPU.
2. Consider also the GPU, when measuring the performance.
3. Pay attention to the processing flow between CPU and GPU.
4. Be careful where the resource is.
29. •
- 5120 x 3200 (elcapitan.jpg)
- 1245 x 1245 (sierra.png)
30. Measuring Code
let time1 = CACurrentMediaTime()
if isMetal {
let metalCell = cell as! MetalTableViewCell
metalCell.metalImageView.textureName = name
} else {
let uikitCell = cell as! TableViewCell
uikitCell.uiImageView.image = UIImage(named: name)
}
let time2 = CACurrentMediaTime()
print("time:(time2-time1)")
Time
Interval
Render with UIImageView
Render with Metal
31. Results
• Metal is 10x - 20x faster!
Time to render an image
UIImageView 0.4 - 0.6 msec
Metal 0.02 - 0.05 msec
iPhone 6s
73. • UIImageView vs Metal
→ GPU
1. UIKit is optimized well with GPU.
2. Consider also the GPU, when measuring the performance.
3. Pay attention to the processing flow between CPU and GPU.
4. Be careful where the resource is.