Defer parsing of Javascript

Hi. The meta.discourse site has a good scoring on PageSpeed Insight and other similar tools. However, it gives warning about slow initial javascript rendering and suggests to defer Javascript parsing to reduce blocking of page rendering. I was wondering if this is something that can be done?

Same recommendation from Gtmetrix
https://gtmetrix.com/reports/meta.discourse.org/Yvo78IWD

This topic may be of interest to you: Google May 4th Core Update impact on Discourse forums (specifically this response Google May 4th Core Update impact on Discourse forums - #76 by sam)

TL;DR it’s being looked at, but it’ll take time there is no quick fix.