Low frame rate in Cubase 9.5

hello there.
I’ve been having a problem recently where I get 1 fps on Cubase. dragging windows around is laggy and scrolling isn’t smooth, meters like in the mixer are not showing the data immediately and things like spectrum analyzers are also delayed.

when I look at the task manager it shows that Cubase is using 100% GPU but the overall usage is only around 20%.

my specs:
windows 10
intel core i9-10900 2.80 GHz
32 GB RAM ddr4
NVIDIA GeForce GTX 1050 Ti

thank you in advance.