Before doing the sql tests I realised there was something else useful I could do. The laptop I am working on now (HP - Windows 10 Pro) had 1.0.245 on it. I upgraded to 1.1.4 - and yes the same problems occur. They do not appear to be as severe, but they are certainly there.
I created a new note. I typed in a paragraph of text. I created a level 2 header. I started to write another paragraph. At the end of this the cursor froze for a smaller but still noticeable period.