Delay shrinking on sticky header

[Nikschavan]

First reported on W.org

Curious when scrolling down and menu starts to shrink we see the background page (white) wondering if we can slow down the shrinking. It seems the hero image has to catch up to the menu so I am seeing lots of white from background. I have a simple maintenance login page because site is under construction…I tried moving hero image underneath put still needs to catch up on scroll…hope this makes sense.