Please go the Lightroom option from the Library Module, then go to the Preferences.
Please go to the Performance Tab and uncheck the option for " Use Graphics Processor"
Restart lightroom, and see if it works better.
Please let us know if it helps.
Thanks for your reply, but the beach ball still rolling for a while when I change modes from one to another. The start up seems to be a bit faster.
Thank you, I'll check it out.