Just installed 8.1.1 HD and wow is the video and editing SLOW
 

I have all the same settings as previous... have deleted the preferences and restarted... and the video is significantly slower than 8.1cs1. I don't know if there is a way to measure the difference, but I am editing drums and it is a a big difference. I can tell it is not a temporary thing, it is a static change in speed... no other programs open. 8 gigs memory. System specs in signature.