Floating button on mobile

I don't think it would make any noticeable difference performance wise.
And if your server has Page Caching then you may find the code gets cached anyhow.

Thanks David

You're welcome

Any chance we can see the final solution?

Sure, you can see the behavior here: https://www.wehkamp.nl/anytime-lang-gewatteerde-jas-donkergroen-16507877/ and here: https://www.verantwoord-afvallen.nl/review/fitbike-ride-5