Hello Giri,
I do not understand why you dropped and recreated all indexes. It is niot necessary to do this with a MaxDB database - index reorganisation is not necessary.
So I cannot believe that this action has any huge influence to your performance.
More important is to run update statistics.
But again , we cannot give you hints to tzune your system without the output of the DB-Analyzer dban.prt.
Regards, Christiane