Abnormal CPU usage after installing i3

I installed Endeavour OS with the original i3wm. Then I was SWAYED and installed sway, of course after deleting all the packages of i3. But then sway was not pretty much compatible with my hardware, so I deleted sway (using the tty) and reinstalled i3. But I noticed something was off. When I had initially installed i3, the cpu usage and memory usage barely touched 5%. But after doing the desktop-drama that I did it’s going upto 12 to 15 % when my browser is on. Can anyone explain what’s happening? When I was using sway, I installed qutebrowser as well.
(I am quite concerned of any unwanted background app running.)