xlet-settings.py performance issue

[ByteEnable]

Cinnamon 4.8.6
no daily builds
Fedora 33
NVidia GTX1060
X86_64 with 12 CPUs @ 4.1Ghz / 32GB     ####DRAM
Samsung SSD NVMe @ 3500 MBps

Issue
xlet-settings consumes high amount of CPU and heavily sputters and freezes while attempting to scroll through icons in the menu dialog -> icons. After some amount of time the CPU load decreases and the dialog becomes responsive which suggests some sort of caching or list is being created.

Steps to reproduce
Install papirus-dark icon theme.
Right click Menu -> Configure -> icon. The icon dialog pops up and select applications from the left pane. Attempt to scroll through the icons.

Expected behaviour
For the dialog to scroll seamlessly and not consume high amounts of CPU.

Also see here:
linuxmint/cinnamon#9905

[OdinVex]

Some apps that use XApp Status Applet don't use the icons from themes such as Papirus[-Dark] in my case. Firewall-Applet, Calibre (Flatpak), etc...