performance issue with advance pricing BSSV (Custome)

Hello,

We need to develop BSSV which will retrieve advance pricing for given number of item .In our case we may pass thousands of item at a time.
to improve performance ,i will write code in NER and call this NER via BSSV but still it will take lot of time to perform calculation .
Is there any way I can do this by cache or any other possible way .
Our requirement is if I pass 1000 item it should retrieve its price based on advance pricing setup which may include lots of BSFN call and table IO internally in minimum possible time .

System info : E1 9.1 ,weblogic server

Regards
Pintya