I just updated to your new V6 theme update. First thing I notice is the Header Banner is often very jerky when navigating between pages and does not always drop down smoothly (the drop down animation). It used to be buttery smooth before the update and now it is not.
In the private content you can find access to our dev site. The testing I did was on the firefox browser.
Please navigate between 5-10 pages and you will definitely see the issue. Sometimes the top banner animation is smooth but othertimes really not good. It suddenly drops down or is very unsmooth. As I said, on our live website (which has not been updated) it is buttery smooth – no isues at all.
We haven’t changed anything in our header banner in the 6.0 update. We tried to visit a lot of pages and the header banner works smoothly https://gyazo.com/82b17266385a4868568c151171b2b4b9
It might happen if your computer CPU is loaded with some process.