As it is my first post I have to say thank you for your great work.
I discover PF not a long time ago and in my first project I wanted to use Skeleton component as placeholder for lazy loading. UI is great but I have to reverse to something more static as CPU usage is high for component that is just placeholder.
To replicate just open Skeleton sample page https://www.patternfly.org/v4/components/skeleton/html-demos/skeleton-card/
as observe CPU usage. For just few components it is easy to notice that CPU usage jumps to almost 10% in my case.