I have been using Affinity Designer for several months, but recently, out of the blue, it lost all the familiar smoothness and snappiness I've come to expect from Affinity. I tried restarting the program and then factory resetting the program. After still experiencing issues, I uninstalled and reinstalled the program. No sign of change. I uninstalled all my fonts, due to a suggestion on the forums. Nothing worked. I then uninstalled and install a previous version of Affinity Designer, and still didn't see any improvement. Although I haven't had any crashing or tools break, it's uncomfortable to use the application. I then switched to trying to use Affinity Publisher and Photo, but unfortunately, those programs are mysterious behaving exactly like Designer. Lag, screen tearing, slow loading times, and rendering failure.
OS: Windows 10 Home
CPU: Intel Core i7-8700
Motherboard: ASUS TUF Z390-PLUS GAMING (Wi-Fi)
RAM: 16.0 GB
Storage: Intel M.2 SSD
GPU: NVIDIA GeForce RTX 2060
Monitor: Dell Gaming (165 FPS, GSYNC, and 1 mil-sec response time)