Thank you for that information, to get some more information about what might be causing this, what current graphics driver are you on? When you’re experiencing the laggy behavior, can you run some sort of monitoring software to look at your GPU usage and temperature? Monitoring the CPU usage would be useful as well. I wouldn’t imagine that it would be taxing your setup that much, especially if the project isn’t large, but it would be good to test.
Also, since I didn’t ask this before, is this behavior something that you’re only seeing in one particular project or even in a new blank project?
I’m sure it seems like I’m asking a lot of questions but it’s due to not seeing an issue such as this before, as it usually is caused by some weird display setup but yours seems normal.