Agree.
As it's right now, sometimes I'm afraid to visit some profiles that I know have a lot of followers because Amethyst becomes too slow if I do it.
Discussion
One unforeseen effect of doing the MediaPlayback in the background is that now when you kill the app via swiping up, it doesn't actually kill it anymore. The objects that were in memory are still there. The only way is to open Settings/Apps and Force Stop it there. :(