I've downloaded version 3.0.11 and now the stabilizer is very chunky and not fluid nor smooth at all, while in plain 3.0 it worked perfectly. What's wrong and how can I fix it?

the things you can try are:

* from the view menu, disable Instant Preview
* enable or disable OpenGL from Configure Krita → Display
* make sure your graphics card drivers are up to date

Nope, all turned off and drivers all up to date :S

If you think you have found a bug, please report it at bugs.kde.org, in this case maybe with a short screen recording if possible. Considering our heavy bugfixing in the past few weeks, it's worth it to try if it happens with the latest beta(you can get these from the main-page news posts).

I've seen some other people mention something like this, but I cannot telepathically tell what their computer specs are, or what they have in common with you that the devs who do use windows don't have.