Tiuipuv

Finally bit the bullet and force downloaded Win 10 v1809 last week. Don't know why Microsoft still won't push a nearly 4 month old update to a year old laptop. Yishhh. Anyways, I opened up Paint.NET 4.1.5 and the scroll lag is gone. As you had guessed, 1809 must have fixed this bug, as VS Code is behaving now too. For anyone else running into this issue still on Win 10 v1803, take a look at KB4462933 for a possible fix. It appears it affects some precision touch-pads in applications that have child windows. This is also why the issue only appeared after 4.0.20, as it is only a bug with WM_MOUSEWHEEL events.

It most likely is not a performance issue, but more likely an input issue with the touch-pad. I did try disabling hardware acceleration in Paint.NET, but it had no effect. I tested 4.1.1, and it has the same scrolling problem, so it is not related to a custom pixel shader implemented in 4.1.2+. It is most likely not GPU related. However, I still sent an email to contact@getpaint.net with two different attachments of Windows Performance Analyzer files+folders. The first was with hardware acceleration disabled, the second with it enabled. Both are under 20 seconds long to try to reduce file size for both of us. Let me know if you would like any other recordings. Once Windows 10 v1809 becomes available to me through Windows Update, I will test both apps and see if it resolves the issue.

Well, I have more insight. I went ahead and reinstalled 4.1.4. Updated graphics driver, was just a minor update available. However, it isn't a GPU issue, even though it appears to be on the surface. I recalled running across scrolling issues in other programs as well, (looking back at you, visual studio code), and determined that it is a scrolling issue limited to the touch-pad. Interestingly enough, In VS Code, I can fix it by resizing the window (bug thread: https://github.com/Microsoft/vscode/issues/34865). This does not work in paint.net 4.1.4. I recommend breezing over the thread to see if it applies to paint.net's scrolling mechanism. Unfortunately for me, I am running the latest version of the touch-pad drivers, so I don't have any quick fixes other than using an external mouse or go over and manually use the scroll bars on the side (instead of the habit of 2 finger scroll). Any idea why this wouldn't be an issue with 4.0 releases? Thank you for the quick reply.

Firstly, I'm a big fan of paint.net and am glad for all of the things it does for the low cost of free. However, with paint.net 4.1.X, the scrolling lag makes the program difficult to use, So I downgraded to 4.0.12 (hosted on an external site), and the scrolling lag disappeared. Is there an easy way I can get some debugging information for you that would help you understand the cause? The computer should be new enough to handle scrolling over the default 800x600 white canvas. The specs are as follows: CPU: Intel core i5-7200u GPUs: Intel HD Graphics 620 Radeon Pro WX 3100 RAM: 8 GB OS: Windows 10 1803 I even went into the switchable graphics settings and force the use of the dedicated GPU (Radeon Pro WX 3100), but this did not change the performance. Thanks for your time.