Cache MailChimp response?

I now manage a site that uses this plugin in the footer on every page. It seems MailChimp have been having some performance issues today, so page requests have taken up to ten seconds due to fetching the list information. It has settled down now, but even so, it’s adding at least half a second to each page request.

Could you please add some caching to the response from MailChimp, for example by setting the response as a transient? (https://codex.www.ads-software.com/Transients_API )

Thanks,
David