Sync does not slow down because the song is bad. It slows down because the rights picture is messy.
Music supervisors, licensors, and clearance teams need clear ownership, accurate contacts, and confidence that the parties attached to the song agree on the record.
When split records are missing, inconsistent, or disputed, opportunities stall. That costs time and can kill placements outright.
Clean split data does not guarantee a placement, but messy split data can absolutely block one. That is why session capture matters long before the pitch ever happens.