This may help others experiencing similar symptoms. The laptop was handed to me to try to make it useable. It was very slow and difficult to use.
If the windows rotating circle of dots was on screen, they would stick for a second or so before continuing.
When using Word the keystrokes were not registered immediately on screen but they would appear after a delay of about a second.
Using the touch pad to move the cursor was difficult to control as it would freeze and then jump to a new position which was too far across the screen.
I tried many fixes suggested by this forum and ultimately a rebuild using Media Creation Tool. Even this was not successful. I checked all drivers were latest versions and discovered the AMD VGA driver loaded by Windows during the rebuild was dated 2021. However the AMD drivers listed in the Acer recommended downloads are either 2015 or 2016.
I replaced the newer display driver with the older version: 2015/07/ 2215.20.1055.0 and all now seems to work perfectly.