10.5 lagging and very slow

i’m suddenly experiencing a very slow, lagging workflow in pro 10.5.

Some issues include, audio dropping out for over 15 deconds when deleting a channel, plugins lagging on insert, windows slow to open, and duplicating is beyond a joke. If I want to duplicate a 4 bar section of the track selecting all channel cubase litrally crashes and finally responds around 2 mins later. No offline processing and around 10 channels of audio with various vsts.

These issues are becoming really bad and I cant pin anything down.

computer has an i7 8700k with 32GB ram. The project is only touching 23% usage on the CPU.

Can anyone assist.

Thanks

Agree, fully confirm!
Everything is Very slow.
Open mixer - 1.5 secons
Insert\open a plugin - 1.5 seconds
etc.
When u try to move a mixer - fps is very low + lagging.
Feal like i have intel Pentium MMX or smth like that…
I think Cubase 10 have a problem with graphics!

I7 6700 16Gb RAM SSD hard drive.

ive got some the best componants in my machine including a M.2 samsung 970 pro and these issues should not be happening.

Same here. Older PC, but Cubase 10.5 is the only DAW that shows this kind of behavior. Even in small session.
i7 5820K 32.0 GB DDR4

same here any solution/.?