Markdown rendering is slow for large files

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I am trying to render a large Markdown file in my application. The rendering is very slow, and the screen is blank for a long time. I have observed that the parsing of the text to prosemirror nodes is quite fast. However, the rendering to HTML is slow, and the nodes are finally added to the DOM together.

I would like to know why this is happening. Is it possible to render the Markdown directly to the browser, processing it from top to bottom step by step, and displaying a limited part to the user?

Specific questions:

What is the reason for the slow rendering of Markdown to HTML?
Is it possible to render Markdown directly to the browser?
If so, how can I do it?
How can I limit the rendering to a specific part of the Markdown file?

Additional information:

I am using prosemirror to parse and render the Markdown.
The Markdown file is about 640,000 characters in size.