I'm experiencing delays and lag with respect to the cursor. Even on a fresh notebook just after launching Mathematica as soon as I start typing the cursor falls behind the key strokes very quickly. I.e. By the time I am ten letters in the cursor is only on the fifth. ( I don't type amazingly fast....) The cursor always catches up and never drops text. If I click into a new cell or highlight earlier code for copy-and-pasting there can be a delay of several seconds sometimes.
It is an awkward problem to describe and I can't give an explicit example. The problem just appeared one day a few months ago and I've had enough of it now. This lag isn't present in any other programs which may be running simultaneously which makes me believe its a setting somewhere. The execution times of cells doesn't appeared to have slowed down.
I'm running Mathematica 126.96.36.199 on XP. I saw this related question but didn't take much from it.
Is the cursor refresh rate set anywhere in Mathematica or has anyone come across this strange behaviour before?