I am working with db2v7.2 fixpack 6 aix5.2

Recenltly we moved our production database to new server ,we did bind the database and ran our daily batch jobs, the performance for all jobs improved except one of them, I checked access path, is exactly like before transfering,
could sombody tell me in which area I should looking for the root cause of this performace issue for this particular job? I should say I restore the backup from old server to new server and I even did not runstats the database in new server.

Thank you in advance for your help