Nothing to be concerned about if the page looks and works okay for you in the browser.
In the fullness of time I might update some of Henk’s themes to try and improve page loading. I would like to ditch support for older browsers and try to re-order things if possible. This might mean simplifying some aspects of the themes to rely more on HTML / CSS effects.
I think most of these existing scripts are very small. So in the grand scheme of things, we’re probably talking about them slowing down a page by hundredths or thousandths of a second. The equivalent time gap of cars across the line in Formula 1 qualifying. So nothing really that the naked eye can see, but testing tools can still flag.