I use Crop tool often, and before 1.9 update, it was fine. But, since upgrade to 1.9 (and still present in 1.9.1), when I select region to crop, click on Apply button, and there is clear delay until the crop is done (approx. 2 seconds), and for a brief time, cropped image is wrong (showing top left part of the image), and then it renders properly. When this happens, CPU usage jumps to 100% on all 8 logical cores.
Before 1.9, all was OK, crop was instant. Also, this doesn't happen always, but it it happens very often to be annoying, especially, if I use crop often. I use Windows 10 20H2 64bit, Lenovo ThinkPad L480 with Core i5 8250 4 Core, 8 Threads CPU, 16GB RAM, 2xNVMe SSD drives. Affinity Photo before 1.9 was fine on this same machine.