After DB Migration Oracle 10.2.0.5 to 11.2.0.3 performance issue

Hi experts,

Key users reported to me that after migrate Oracle 11g whole business processes are slower than the past sistem wirth 10g.

First we update oracle statistics as per note1020260 from all the 3 kinds of oracle statics to improve CBO procedure.

Later we wondered that without a complete ( E2E ) analisys it was imposible to solve those performace issues.

We open an OSS ticket and all recommendations were create index for SQL statements.

SAP RELEASE :4.7 set 2.00

Oracle 11.2.0.3 Opatch ( January 2013 )

Somebody were on similar situation ?

Cheers