Zorin 16.2 slows way down while using hdmi monnitor

My HDMI Monitor, zorin slows down when I close the laptops lid. My laptop Is a MSI GL75 Leopard with Nvidia video card. I chose install with Nvidia drivers. It doesn't matter what display option I choose except if I choose Single display and my monitor its slow weather I have The lid open or closed. I installed Tweeks and unchecked Suspend when lid is closed, but it didn't help. The computer is so slow that it is unusable. please help.

Hi Ted. Can you tell us which edition of ZorinOS you have e.g. Pro, Core, Lite etc?
Can you also please edit your forum profile to indicate that there. Thanks. Zab.

Which Nvidia card do you have, and what drivers have you tried already?