I haven't objectively measured it, but it's negligible for me. Noticeable, maybe, but not problematic. I also have a lot of VMs and containers running in the background.
The only thing I have to figure out is how to get rid of weird freezes and stutters. They weren't there when I first set it up (system was practically as responsive as bare metal), but with the heavier load (or maybe Windows shenanigans) there are some small issues.