launchd and UserEventAgent using CPU excessive

My iMac has fonctionnee slow down a lot, but not all, of the time.  In Activity Monitor CPU usage usually settles down for something like this a few minutes after the connection:

There are periods where the CPU usage returns to normal.

The CPU usage is normal after I restart mode without failure, but the problem reappears when I then reboot in normal mode.

EtreCheck evaluates the performance of excellent from good to bad depending on when I run, but EtreCheck does not seem to indicate a cause.

Any suggestion will be highly appreciated.

Me again... I found another post where someone has offered the following troubleshooting suggestions:

1. open the activity monitor by typing "activity monitor" in the spotlight search.  This confirms launchd is the memory of pigs

2. open a Finder window and type select menu: go > go to folder (or at the same time press the keys CMD + SHIFT + G)

3. at the prompt, type "/ var/log" access to the folder of the machine that contains the log files

4. set the 'Change' case and look for the latter file called "system.log".

5. double-click on the file to open it in the Console application

6. scroll down and see if all the lines contain 'mistake' that back as far as when you have noticed that the machine was hot especially repeated lines.

I did the above and got a system.log 160 pages covering about 12 hours.  Search found Spotlight 'messages' error on the 93 of 160 pages, but I do not see the lines that are repeated constantly along the.  Here are some screenshots of the system.log.  They leave something I don't see?

Tags: Mac

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