A significant difference between the metrics captured at Proxy and BS level

Context: -
          Currently we have following set up for a particular OSB project.
AccountManager
          Interface …… (this has all the schemas and wsdls)
          Services
               AccountManagerProxy… (Proxy service)
               AccountManagerBS … (Business service)
AccountManagerBS – is configured with end point URL to interface with back-end system.
AccountManagerProxy – includes a ‘Route to’ action for linking to AccountManagerBS as given below
The performance monitoring is enabled at AccountManagerProxy and AccountManagerBS level.
Test Scenario: - I am running a simple load test for AccountManager and checking performance metrics from OSB dashboard.
Expected behavior: - The performance metrics at proxy and at BS level should not differ more than few milliseconds (10-50 msec)
Problem Statement: - I am seeing a significant difference (like 40 to 50 seconds) between the metrics captured at proxy and BS level.
     As an example, the number at proxy level is “1 minute 20 seconds” and the number at BS level is ‘500 milliseconds’
     Moreover, this behavior is not consistent. It has started showing this behavior in last few days. The further impact of this is ‘stuck threads’ on webLogic server and hence the high possibility of memory outage. I have already restarted the Admin/managed-1/managed-2 servers couple of times.
Can anyone help me understand and identify the exact problem area for this issue?

does your proxy do any authentication with any 3rd party auth providers ?
Also in proxy service monitoring are you seeing all time at route node ? .. is the business service request type different that the contents of $body before the route? .. there could be some implicit transofmations if yes...

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