Help with cccam issues

Could someone please help me. I am having issues with freezing and cccam taking time to respond when I change channel.
Most channel work perfect including sports/movies but on certain channels it just non stop. The server is working fine as I have tested on another system.
The only problem I can come up with is, the server has many cards but I only use one.
Can I configure my cccam.cfg file to ignore all cards but 28.2 sly card?
Anything else anyone can come up with to resolve this issue, please help

Regards to all

Thank you, that worked by getting rid of unwanted cards and has improved the issue.
would you know of any other optimizing I could do to improve my experience.
am on newnigma2 using cccam 2.2.1, Dreambox800HD