That sounds similar to a tablet/stylus with a too low reporting rate, an issue @AhabGreybeard described well in the past. Does your stroke look like the pictures in the linked postings below?
Since the accuracy of mice also depends on reporting rates, and especially the cheaper ones can have far lower reporting rates like good gaming mice often have, this may be the issue. If you are lucky, your mouse driver offers a setting to set higher reporting rates.
But let’s see what you will answer.
That’s right, if I move my mouse slowly, the curve is drawn smoothly. But what I want is a change thickness based on speed, so moving the mouse slowly is not the solution.
My PC is very old… I’ll write down the detailed specs. MoBo : Asus H81M-E CPU : Intel Xeon E3-1231 v3 GPU : Nvidia GTX 1050-Ti
That’s an old CPU but it’s more powerful than the CPU on my old computer.
However, I don’t have a problem with fast mouse drawn curves.
Your Logitech mouse driver may be a little on the slow side.
(Did you install the Logitech mouse driver?)
If you disconnect the Logitech mouse then connect an ‘ordinary’ mouse and do a full power down restart, you may find that the standard generic mouse driver is better.
Also, don’t run any other application at all when running krita.
Brush size variation controlled by speed is done in the brush editor (F5):
With the cheap budget mouse I have at work I have the same issue. The mouse does not report its position fast enough when the mouse dpi setting (it has a button with preconfigured DPI settings I can’t change) or mouse speed is too high in windows. I can mitigate it by setting brush smoothing to Basic in the Krita’s tool options docker.
Not ideal when you work with a pen but should not have any downsides when working with a mouse.
How do the performance settings look in Krita’s settings? Although it would surprise me if it’s the CPU. I have a powerful CPU here at work it’s just that my mouse is kinda bad, maybe costs 10 bucks or less. It’s basically trash.
Hello 