High CPU usage when using Clip

Steps to reproduce:

• open Inkscape and a cpu monitor
• after initial loading, inkscape sits there and uses very little CPU (<1%)
• create a rectangle
• create and overlapping circle
• note that Inkscape is still using <1% CPU when you do nothing
• select both shapes and select "set clip"
• do nothing: Inkscape is using a fairly high amount of CPU (30% on my system) even if you do nothing for along time

That 30% CPU usage also corresponds, at least on my system, on a slowdown of the user interface for a fraction of a seconds every few seconds

What happened?

If using clip, Inkscape using a fair amount of CPU power even when nothing is happening. This also corresponds to a slowdown of the user interface.

What should have happened?

Inkscape should use almost no CPU when the user is not interacting, as it does when clips are not being used.

Inkscape Version and Operating System:

• Inkscape Version: Inkscape 0.92.4 (5da689c313, 2019-01-14)
• Operating System: Windows 10 Pro
• Operating System version: 10.0.17763 Build 17763

Hardware: Lenovo W550s, Intel Core i7-5600U, 16 Gb RAM