Brush strokes become jagged after a few seconds

[Chris Beatrice]

I've tried just about everything to narrow down and eliminate this problem, with no luck.

When I first start PS and paint a line with a simple hard round brush, it's nice and smooth. After about 15 seconds (or 4-5 lines), the lines become jagged.They're not pixely - it's more like what happens if you have smoothing turned off. The effect is more pronounced when I paint zoomed out, as if the input data is constrained to the zoomed out pixel size.

This is not a tablet problem - it happens with the mouse as well.

It does not happen with the lasso selection tool, so it seems limited to the brush tool.

Here's an image showing a series of brushstrokes, going from left to right.  You can see how the stroke quality degrades from the first stroke (on the left) which is nice and smooth, to the strokes on the right which are jagged.  You need to view the image at 100% to see what's happening clearly.

The fact that this problem doesn't appear when I first start the program, then creeps in, is really perplexing!  Once it starts it never goes away.

[John-Marc5E73]

I fixed the problem. I bought a Huion tablet.

Never solved the problem with Wacom. They keep telling that the problem is not their product.