I have been using BitDefender Internet Security 2012 since January and have been happy until recently.
The problem lies with the automatic updates. These appear to run every hour or so and when doing so take up so much CPU resource that it slows my laptop to a crawl.
The processes that are running at this time are:
bdagent.exe
updatesrv.exe
vsserv.exe
downloader.exe
installer.exe (runs less often than above)
There is no option to schedule/reduce the frequency of checking for updates. I changed to BitDefender from McAfee because McAfee was occupying excessive resource.
I would welcome any advice.