Follow-up Comment #4, bug #19948 (project mypaint):

The profiles shows exactly what I expected from your description: MyPaint is
busy processing hundreds of device change events.

This is a Windows specific GTK+ tablet support bug, which I spent some time to
help debugging some time ago. The problem is that MyPaint gets both events
from the tablet and from the "mouse" when you only use the tablet. Here is the
bugreport: https://bugzilla.gnome.org/show_bug.cgi?id=653437

The fix committed into GTK+ by Alexander Larsson actually did fix this "device
change" problem on my Windows Vista test system. AFAIK Tumagonx has built the
release with that version.

So, maybe some of the newer Windows releases ship with a wrong (too old) GTK+
library again? To figure out what is going on, please check the version of the
GTK+ DLL for both versions of MyPaint (I think you see it when you hover over
the file with the mouse). You can also try to replace the DLL with a newer
version.

It is of course also possible that the bug was not actually fixed in all
cases, or that the fix doesn't work with the newest wintab version, Windows
version, or similar... but first check the DLL version.

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