Description:
Let's assume the Landing Page content is translated into 20 languages. When updating such content in the Page Builder we are in fact updating every single translation behind the scenes. Let's take a look here and scroll to line 1317.

If our Landing Page has blocks with multiple relations, like 10 each, does it make sense to build all relations for every single language? appendFieldRelations in the mentioned foreach is actually doing this. Assuming very complicated LP setup and multiple relations we are prone to timeouts when publishing.