I am running into performance issues when using MB Blocks on sites that have over a few thousand posts published. I use quite a few "Post" and "Taxonomy" field types in my blocks and I find that the block options take a while to load and also run into issues with blocks when having to use the "post" search field. Making the user put in a post ID is not an option as I need to have a friendly user interface so I like using the select advanced with posts and taxonomies.
I have implemented a minimum input length to not stress the text input as much, along with reducing the query return to 5, however that doesn't seem to really do much. I also have turned off all core WordPress blocks and am only loading the meta box ones I created as custom blocks.
I am curious if you have any thoughts on other field settings or things I could do to try to speed up the loading of block options and reduce strain on the server for the advanced post search field? There may be options I am not aware of that I would like to try out.