I used a plugin that does the same thing you did but it gives the report so I can show how much geometry was had Untagged assigned to it.
that’s a good way to go.
Anssi’s point about leaving the rounded edges off is a good one. The radiused edges just load up the file.
On a small file like yours it doesn’t have a huge impact but as your models get larger, that kind of thing can make a difference in performance. Unneeded geometry can make your models difficult to work with. Another reason for leaving the edges of the planks square is it makes them easier to work with if you need to make changes.
By the way, are you using 4x6s for the longer joists?