I have the same problem in our ASA 5520 with SSM-CSC module. It has been working for 1 year and some time ago people started to complain. I now can see that CSC SSM CPU Usage is a sustained 20%, and have some 60% or even more peaks.
You mentioned that you are having performance issues with the CSC module and you also mentioned "As soon as HTTP is removed from the Service -Policy-Rule on the firewall, the access to internet webbrowsing is as âfast as normalâ".
You should not inspect traffic with both the CSC module and the HTTP inspection, as this will cause the performance issues you are noticing. This is why performance returns to normal when you disable one of the two inspection methods.
I would recommend disabling the HTTP inspection in the global service policy permanently. This is mostly doing protocol conformance checking. Let the CSC module handle all of your web inspection and you should be fine.
Also, while you're looking into this issue, it is also a good idea to upgrade your CSC module to the latest software (if you haven't already).
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...