Whenever I add a Pattern Fill layer and start scaling it down from 100%, the quality of the image changes drastically. Even 1 % makes a huge difference. I've been on remote assistance with Adobe 3 times now and every time the conclusion is that it must be my graphics card. It is indeed old and I have some problems with it, but I did try the pattern scaling feature on a gaming computer with a decent graphics card and the result is always the same. On 99% the image blurs visibly, while on 101% the change from 100 is not very visible. Let's say I have a pattern swatch I made in 2000x2000 px with 300ppi. I open a 5000x5000px document, apply the pattern and most of the time I don't need to do any scaling. However when I need to put the same pattern on a 1000x1000px canvas, I do need to scale it down quite a bit to get a good result. I took screenshots on the PC with great GPU to demonstrate the issue.