Hey,
I've been experiencing this problem since the beginning of my usage (27.9.2018). After starting Designer up, it's acting ok. But 1 minute into running (approx.), stops responding for a while. Whole system is having inconsistent freezes while this lasts (sometimes more, sometimes less).
I've created a video of this happening - few things are pixelated, in post-production. You can notice green and red border which is changing - I've added that to make it easier for you to see when the lag starts, and when whole system freezes. There's a video playing on youtube to make freezes even more visible for you (even mouse freezes during it).
Green = everything's fine, Red = Affinity Designer is not responding, Intense Red = whole system froze for a while
Timestamps:
0:02 start of Designer
0:28 project opened
1:21 Designer not responding
1:37 first freeze of system
1:53 second freeze of system
2:02 back to normal, ready to be used
Windows 10, version 1903 - up to date.
And yes, this happens if I load any project. I wasn't going to post this, but it got quite annoying after a whole year.
affinity.mp4