Hi SSoumya.24, below are some links that may give some insight on FTP virtualization. I do not have an answer for your TPS requirement because there are many variables that can affect TPS rates such as # CPU cores, processor speed, other concurrent activity on the VSE server, JVM memory, garbage collection, file payload size, customizations used in your models, and the list goes on.
I would start with this question: Do you have a performance VSE license?
Links that might help you:
FTP Virtualization doesn't work
Regards, Joel