I have run basic test in Safari devtools and it looks that this section (probably Aurora elements as when they not in DOM all work relatively smooth ) take tremendous CPU for rendering. Try to find on net similar issues of blur or whatever filter in Safari to find what cause CPU drain.
EDIT: I also see that you re using
backdrop-filter on glass class but if you look on caniuse on Safari is this feature supported only with
-webkit- prefix. It doesn’t mean that this is the issue but is something you should fix.
I have just search net for
blur stats and it is pretty CPU intensive as it render and calculate pixels 1:1 and it is slowest filter in CSS filters options. You are using pretty large areas with large blur value this mean lots of CPU drain and slow rendering response.
Hope that someone will be able to give you some solution.