Thans Christian, the things is... my computer hardware might not be the faster ever but with other long blog posts is ok (with no VC). So that shouldn't be the main issue. I think that VC, using it with a lot of nesting and shortcodes adds a lote of extra code and on long posts like this, the issue is super evident? I find that on shorter posts (not more than 3-4k words) VC performs normally, after that it exponentially starts to slow down until it gets completely stuck.
Thanks for submitting this issue to the developers. I am aware that using VC and other page builders for super long content is not ideal because it adds the extra code but getting a post completely stuck is a bit too much.
I will split the post in 2 (I was already working on it today), the situation gets slightly better at least and for future long posts like this I'll have to find another solution because also using another page builder like Cornerstone will add code too and we are at square one again... Too bad as I need a certain type of post (quite long) and layout to convert my affiliate links.
Thanks again for your help