Choochi,I think you can judge by how much we got from just one plant,at my house it's hubbies baby and he keeps it from growing all over the yard.
If you want to cover a pergola it's great,but be prepared for a lot of trimming,I think I would probably try something else,if I were you.
I cannot think of something specific,that grows fast,but there are several vines to choose from.
"The cruelest animal is the Human animal"
3 kitties,Rocky(r.i.p my boy),Chico,Vinnie