Thanks for the reply. Sorry I did not get back to you sooner. Your response ended up in my junk folder.
I wish I had VR to complain about and I just purchased the campaign a couple of weeks ago.
It seems like my issue is, so far, just on mission 1, I assume it is because of the number of units and me having a 6 core CPU. I have played missions 2 - 5 with no frame rate issues at all and am really enjoying the campaign.