I had really slow wait times as well with 7.5, and posted around a month ago about having to wait seemingly forever for the Windows ‘hour glass’ to disappear.
For me the answer was to right-click on the Cubase start icon and then click on Properties.
I had to un-check Run in compatibility with Windows 7, and that fixed it - to no more than just a second or so.
Just something for you to consider & maybe try.