2 server with same configuration but huge difference in performance

Hi,

I have 2 PG servers with same h/w and configuration and they are not in
replication.

On server A it takes 20 minutes to execute the script.
On server B it takes more than 20 hours. (Seems to be stuck with create
index and and create foreign key steps)

Any guidance to troubleshoot this would be highly appreciated.

Thanks & Regards,
Sumeet Shukla