WordPress Post Publishing Caching

I have several thousand posts in my wordpress database and use w3totalcache (page caching, database caching and object caching).

WordPress has become unusable. t takes several minutes when I publish or save a post before I can continue to work. Often, I get redirected to the posts list when I save a post as draft.

Question: Does wordpress flush the cache of all posts when a single post is saved or published? That’s the only explanation that I have for this extremely bad behavior.