Get things organized !

create table Testperf (col1 varchar(5000) )

cannot be a reference because of ... table design.

No indexes, a table with a single column, ...

If you want to stress test io try SQLIOSim tool (download from MS)

After you migrated the db to prod, did you perform db maintenance ?

- rebuild indexes

- refresh statistics

What performance issues are you getting ?

- timeouts

- deadlocks

- ...