User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
Firefox/52.0
Build Identifier: 

When I copy files over a network (using Dolphin) the CPU load starts to rise
quickly. An animated icon in the system tray shows the progress of the file
transfer. If this icon is hidden via the system tray settings the CPU load of
plasmashell drops quickly. I've attached a video that demonstrates this
behavior.

This bug is probably related to Bug #1016920 that occured (or still occurs) in
Leap 42.2

Reproducible: Always

Steps to Reproduce:
1. Copy files over network using Dolphin file browser

Actual Results:  
CPU load increases significantly

Expected Results:  
CPU load shouldn't be affected that much by an animated icon

This is probably not tied to file transfer but it's an easy way to reproduce
this behavior.