Upgraded from LO V 4.2.4.2 to 4.2.5.2. The problem appears resolved. Time from click of "File" on menu bar to when the drop-down menu appears: is near instantaneous. Hovering back and forth with the mouse over the top-level pull-downs (file, edit, view, etc.) works again without that disappointing "(Not Responding)" showing up in the Active Title Bar. Started and stopped calc multiple times and performance did not degrade.
Upgraded from LO V 4.2.4.2 to 4.2.5.2. The problem appears resolved. Time from click of "File" on menu bar to when the drop-down menu appears: is near instantaneous. Hovering back and forth with the mouse over the top-level pull-downs (file, edit, view, etc.) works again without that disappointing "(Not Responding)" showing up in the Active Title Bar. Started and stopped calc multiple times and performance did not degrade.