Watch this when you get a chance https://youtu.be/t3p1DZyHJnc
although based on who’s on the video, I’d guess you misunderstood what they were saying.
But don’t take my word for it (or anyone else’s for that matter)… you can (and should) use your browser dev tools to see what data is being loaded when. You’ll see, plain as day, that what you said in your previous post is factually incorrect.
In any case, that video is 18 months old, so any references to do with performance will be based on the old Capacity model.
Now that there is no capacity, and pricing is based on WU, much of what was true a year ago, is no longer true (in many cases it’s the opposite).
But to re-iterate and correct your misunderstanding - data from a connected datatype IS NOT loaded when the parent Datatype is loaded… the connected datatype field is nothing more than a short text (the Unique ID). Off course, if you reference data from the connected datatype, then that thing will be loaded - but that’s still more WU efficient than doing a search.