My PC:
notebook
CPU: Intel i7 2.9Ghz (quad core)
GPU: Nvidia GTX 940m
OS: Windows 10 64bit
Time:
GPU:
Tile= 960x540: 5:30 (full image at once)
tile= 480x270: 6:30 (1/4 image)
tile= 240x135: 5:40
tile= 120x68: 8:30
tile= 16x16: 2:04:41 !!!
tile= 32x32: 34:00
CPU:
tile= 960x540: 20:10 (not using all cores…)
tile= 480x270: 8:10 (1/4 image. all cores in use)
tile= 240x135: 10:40
tile= 120x68: 8:40
tile= 16x16: 9:16
tile= 32x32: 13:40