Don't waste your time trying to work with the VSE people to figure the memory leak out. It has been this way for YEARS (since v13), it wont be fixed. We spent many hours working with them, sending info and responding. It was all a waste of time. All I do is simple editing of files, have a couple small macros that I rarely use. It eats memory like crazy. Working on a 5MB file that was already saved, I hit save again and the memory allocation went up 50MB. I had to shut it down and restart today when it got up to 6.6 GB. Were it not for the fact that I have 100 people who have used it for years (some 15+) I would switch to something else.
So annoying that they don't care to figure this or, or CAN'T.