At least the issue with the Manipulators going to 800+ms is not happening in PG areas only.
Also the memory leak topic is something I could rule out in this case since both memory values are far below the limit as one can see in the screenshot.
To me there are two significantly different effects appear:
- Manipulators to 800+ms cause a slideshow entirely with a pretty consistent 1-3fps while in that area, even when pressing ESC to the menu it remains that way. This seems to happen at specific locations and is reproducible.
- Sometimes randomly the fps go down quite a bit but remain playable (15fps or so) and recover after some time. This effect wasn’t reproducible for me, but I believe it has to do with data streaming from Bing.