It looks like it's Samsung"s version of virtual ram, which either many makers are pushing, or it was part of a new Android update.
I have virtual ram on my two Xiaomi phones, (which they push in their marketing) called Memory Extension offering 3 gb of available device storage, though they have 8gb and 6gb of ram anyway and I have it turned off.
I've no idea if it really helps, or slows things a tad wgen it kicks in.
I think Xiaomi had a habit of killing some apps, but I'm so dumb I don't probably notice much if it happens often. Sometimes yes.
I expect virtual ram would be theoretically more useful on low spec budget devices. Conversely because of a lower power chipset it may slow things down as well.
IDK, I'm just taking my brain for an evening stroll.
If you turned it off, but it's slower than the previous UI with it on? I would guess it's something else and like a million people you inadvertently became fixated with displayed ram usage, and it's something else as B. Diddy said that may be affecting it, or a setting in the new UI 5.1?
Did you have UI 5.0 before, or 4.x, and is this device new to you. It may also take a while for a completely new - ish UI, say 4.0 to 5.1 to bed in.
https://forums.androidcentral.com/e...-ram-plus-and-how-to-use-it%2F&token=ZaAidFKH