On Nvidia cards, you may encounter some issues such as slowdowns or the game not exceeding 30 fps.
Workarounds to try below.
First, you can check the resolution via the Nvidia control panel:

 

1-Right click on the desktop and click on NVIDIA Control Panel

 

2-On the left you have the tasks. You can click on Display, then Change resolution

 

3-Choose the screen if you have more than one, then select 60Hz from the drop-down menu

 

4-Another option that can be checked is the vertical sync. On the left in the 3D Settings section, click on Manage 3D settings

 

5-After that select Vertical sync and set it to off in the drop down menu 

 

If the issue remains after that you can you can check if the right GPU is selected. Process here