JQuery - Third-party code blocked the main thread for

Jquery results in:

Third-party code blocked the main thread for 590 ms

The theme is modification of Ghost Ease.

Trying different versions of Jquery and CDN-s results in different outcome.

I’ve read controversial materials on the topic.
Is it possible to use defer / async for the ghost JQuery script or completely remove it?

<script
    src="https://code.jquery.com/jquery-3.5.1.min.js"
    integrity="sha256-9/aliU8dGd2tb6OSsuzixeV4y/faTqgFtohetphbbj0="
    crossorigin="anonymous">
</script>

It seems that some parts of ghost are not working with jquery + defer like: image loading.
So adding defer is not an option.