KDE Plasma Slow Down after Applying xrandr

Hello guys. I just joined this KDE forum. I actually like KDE Plasma because it is easy to customize.

Previously I used it on a laptop with a resolution of 1366x768. Because I felt the workspace was too “narrow” so I used custom resolution to 1600x900 with this command

xrandr --output eDP-1 --panning 1600x900 --scale 1.171303x1.171875 ;

Then i restarted KDE Plasma

kquitapp5 plasmashell
kstart5 plasmashell

So it looked like this

The problem is that after I applied it, KDE Plasma became slower than usual. Every time I hover my pointer over the system tray, open the menu, or edit a panel, the animation seems to slow down. everything is delayed

Is there any way to solve this problem?