I agree that a large library will always heavily increase the ram usage, but Quod Libet is just less efficient in this regard than some others. I still use it as I like it best and it has done the best at filling the niche that foobar2000 did for me in Windows (minus the insane UI customization ability). Being in Python also makes it super easy to extend. It isn't even close to 4th on my system in memory consumption, but my PC does triple duty as it is my dev workstation, media server, and personal PC. I'm actually shocked that RSSHub uses so much! Is that also a case of a large "library" of sorts?