Upgrade from 11.5.10cu2 to R12.1.1 : u667700.drv : Following sqls take long time to complete. cs

Hi ,
We had couple of rounds of test upgrade from 11i to R12.1.1 .  During the iteration, we found the following sql's are taking long time to complete

cstpostimportaad.sql                         8hrs 45 min
appostimportaad.sql                          7 hrs
papostimportaad.sql                         4 hours
arpostimportaad.sql                         2hrs 15 mins


Can you please suggest any workarounds to improve the performance of these scripts.

Thanks
Ram