Osb proxy service with owsm policy auth slow when soap request very large

I have a proxy service which is security with owsm policy: oracle/wss_username_token_service_policy, the proxy service simply route to Business Service which directly invoke a bpel exposed web service, when I call the proxy service with soap envelope large than 15MB(not attachment), waiting about 4~5 minutes, the bpel instance created ; but when I remove the security policy:oracle/wss_username_token_service_policy, it will cost only 20 seconds, why authentication cost so long? How can I deal with the problem?
My English is poor, please don't mind!
besides, with my OSB version is 11.1.1.6.0

I finally figured it out. The nullpointer exception is related to the SAML assertion. The SAML assertion in my requests is signed with embedded signature and this seems to be not supported with the used OWSM policy. Without the signature is the exception gone.
Marian

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