Comodo Internet Security and RAM


my Comodo Internet Security Premium uses 550mb of RAM. Is this normal?
And it is just running in the background and only the Firewall and Antivirus is running.


No, that is definitely not normal.

How much RAM is being used depends on what CIS is doing at any given time, but on average, normal operation seems to be around 10-15MB.

If it consistently uses 550MB of RAM, you might want to consider posting a bug report.