Hello. I came back on Arch from weeks of using Debian.

Here's the thing I noticed on Debian:
So I was using my PC for 8 hours straight with 4 browsers running (I'm a web dev student).
My ram usage was around 2GB - 3GB with 900MB swap (In debian, the default swap size is 1G). When I close all of them, the swap decreases after few seconds to 0 without freezing and lag (I really like this).
When I was using Arch, I also do the same thing, when I close all of them, the swap usage stays the same with having 800MB ram usage (I'm using KDE).
But when the swap usage starts decreasing the PC starts to freeze and lags until it goes to 0 (I hate this).

So, I want to ask. Is this thing related to the distro itself or it's kernel? If yes, is there workaround I can do to achieve what debian do? (I know arch uses the default kernel)

That's all, thanks.

PS: English is not my primary language but 2nd language. I'm sorry if there's some grammar mistakes on my post.