Page Speed: render-blocking JS from Hubspot CDN, can I use async attribute?

Develop, Build & Integrate CMS Development
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You can check this post: https://community.hubspot.com/t5/Content-Design-Questions/How-do-I-disable-JavaScript-and-CSS-render-blocking/m-p/40846/highlight/false#M3769

and my answer how to remove .js and .css from HubSpot pages.