I don't know anything about deamons and agents except they come up in activity monitor and take 90% cpu and are vague and have no idea what tied to..
But these two issue tied to small 3rd party apps.
LaunchAgents and LaunchDaemons are Apple's preferred method of launching Applications and Application helpers at boot time as opposed to Startup items in the user's account. LaunchAgents are
intended to be specific to a user and LaunchDaemons are system wide. Generally their name is a good indication of the product they are associated with. For example in Artie's list com.bombich.ccchelper.plist is Carbon Copy Cloner's daemon that triggers CCC to run on a user specified time schedule, com.microsoft.autoupdate.helper.plist checks version numbers, downloads, and install Microsoft product updates,
etc. The Daemon itself runs only at launch time and is extremely unlikely to be the cause of an ongoing problem but the application it launches may be running in background continually and could easily be related to your noise issue.
NOTE: When you say "...and take 90% cpu..." remember that is 90% of the CPU cycles
THAT ARE CURRENTLY BEING USED. Take a look at the bottom of the Activity Monitor window where the CPU cycles in use by the System, User, and Idle are listed. That 90% figure might be 90% of the two or three percent used by the system or user while 97% to 98% of the
AVAILABLE CPU cycles are idle or unused.
RECOMMENDATION: Rather than deleting a LaunchAgent or LaunchDaemon the preferred way of deactivating one is to move it to another folder such as LaunchAgent (Deactivated) and LaunchDaemon (Deactivated). That way you can easily reactivate them if deactivating it does not solve the problem.
