For customers using Change Data Capture or Q Replication where the products are using IFI 306 reads to capture log records, there is a DB2 11 enhancement that has retro-fitted to DB2 10. The enhancement perequisites v10.2.1 of CDC so you will need to check if your tools are at the correct level. With this APAR you can specify a subset of DBID and PSID pairs that your subscription should be tracking, instead of the filtering occuring after the records have already reached the replication product. This way not all of the log records from all of the tables marked with 'data capture chages' get pushed to the replication product. The lab noticed a significant CPU reduction in the capture application with this fix on.
PM90568- IFCID 306 filtering for V10