See this thread: https://discussion.fedoraproject.org/t/fedora-kde-spin-on-new-thinkpad-has-strange-stuttering-lagging-in-some-windows-but-not-others.
This is kind of a re-post, since it would seem that my original post was abandoned.
Sadly, my Dad is (still) getting a bad impression of our wonderful free operating system. Please help me fix that!!!
The original thread was not abandoned. The last reply post on it was 2 days past.
Please keep all activity on a single thread so it is easy to follow the discussion.
When the OP continues to participate the thread continues. When the OP no longer participates it dies.
I am closing this one as a duplicate.