Checked your video. What I saw in the video is perfectly acceptable for me. Don't know how often you get the occasional stutter. But my experience with iso9 hasn't been that great. I've rolled back to 8.4.1 and will OTA next week when it officially releases. Hoping for the best.
If it the GM didn't work well for you, then the release next week won't either, as it is the same download.