We have recently moved an application from WAS6 to WAS9.
In production, we notice some performance issues with a stacktrace from the application logs that pointed towards a compatibility issue between Introscope MQ PowerPack and SSL. We did some testing to verify this in our QA environment.
Non-SSL Queue average response time is 6ms, but average response time is 100x slower when SSL is enabled (600ms).
As a workaround disable SSL