reCAPTCHA and Google Page Speed Insight

[Emanuel -S]

I try to optimize all my websites and normally reach 100% at the Google Page Speed with the Insights-Test - Mobile & Desktop. 

But at one page, where I've included the reCAPTCHA (submission form for url-shorting), the Insights-Test recommend, that I should compress the JS File (recaptcha__de.js) and also turn on Browser-Caching for the api.js - but both files are just included and hosted by Google itself. I don't understand, what are the possibilities of caching and compressing without self hosting these files?

So... what can I do, to include reCAPTCHA in my side, but also optimize the output and speed of this external files (cache gzip / deflate is already included with htaccess, but just for local files). Because I want to reach the 100% as matter of principle. =)

Thanks!