I put in an enhancement request on /hi/ for this, but I figured I might as well post one here too.
It'd be really nice if there was an option to only load related lists on-demand, when the tab functionality is enabled.
That way, some tables/views that have a lot of potential related lists (like core_company) have all the related lists available, but don't consume as much bandwidth, and load much faster. I noticed the load times on forms (with related list tabs enabled) seem to be a bit longer than normal, and this would help with that as well.
