Plasmashell has a memory leak

That bug report is atrocious.
But at least you added this response to a comment:

Although Deepin and Cinammon are also installed on this system.

So thats slightly more information than filing a bug with nothing but a screenshot of the Monitor.

Seriously - have more respect for other people than that.

…anyways…

… I didnt ask you what branch … I asked you if you were using git packages.

pacman -Qqs '\-git'

(and in case you need reminding: [HowTo] Provide System Information)