Joomla, Virtuemart + Cloudflare page speed troubles

Dear experts.
We have measured the page speed of our eCommerc store by Google PageSpeedInsight.
It shows: Third-party code can greatly slow down the loading of site pages. We recommend using only the most essential third-party resources and making them load last. And the link to Cloudflare cloudflare-static / rocket-loader.min.js
(ajax.cloudflare.com)
It shows Main thread blocking time - 644ms.
Our Store running on Joomla, Virtuemart (all uptodate). The hosting is good - VPS servers.
(On the clodflare we turn ON the rocket loader).
So the question: is it possible to reduce this blocking time?
Thank you for any advice.

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