kernel task

Directly via usb. Also used to work wirelessly when I had them connected to an AirPort Extreme (the router died, the printers live on).

I just added the printers in System Preferences->Printers & Scanners. They were immediately identified and the drivers downloaded automatically.

They are multifunction DCP-145 and DCP-197.

They work fine as printer and scanner. I scan using Preview. No need for extra Brother software.

I have the fall 2014 mac mini too. I didn't notice the kernel task issue. I've always run Yosemite on my machine. I couldn't get some of my software to run with El Capitan, so I gave up on the upgrade cycle. I did see slow performance in the finder. I upgraded to an external ssd drive. My plan was to swap the internal harddrive for an ssd drive. To get things moving, I put the ssd drive in an external drive. Performance improved enough that I'm happy.

It is important to get a fast external enclosure. Another external enclosure for a 2.5" drive was too slow. Both are OWC external drives give them a call and ask for advice. forget what ssd drive I bought.

System Software: macOS Mojave 10.14.5 (18F132) Time since boot: Less than an hour

Free RAM: 15 MB Used RAM: 5.03 GB Cached files: 2.96 GB

You have done a lot of paging for only being up for an hour ... I think.

I have no idea what kernel task is running slow. How about a screen shot of activity monitor picture?

kernel_task seems to be a core macOS routine. I have click on total cpu time. Would be nice to see a similar picture of your machine.

You seem to have reasonable system.

What to do?

-- run activity monitor on memory. See if you can figure out what is causing all the paging.

-- run less applications at once. see if you can get paging down.

-- upgrade to an ssd drive. This will sped up your system. any paging will be faster.

-- like I say, I'm running yosemite. You might consider downgrading to sierra/high sierra. Have multiple backups and a bootable external drive. see ccc.

R

Please run Etrecheck and post its full report here. Use the "additional text" button and paste the report into the text box.

There is no such thing as a psychic...

We need to know information so we can help.

Sorry, I don't see any obvious red flags in the report.

You could try creating a new user account and checking for a while to see if kernel task also shows as using a lot of cpu.

I have some doubts about the "brother login server". It may be rather old, and probably unnecessary (I have two Brother all-in-one printers and have not installed this in years, and they work just fine).

I read about kernel task was an internal procedure to cool down the CPU, but the fan never starts.

I don't think that is its major task. It may do that but it doesn't need 140 threads to monitor the fan.

Slow opening of apps was a symptom that I had before the upgrade to an ssd.

I leave dropbox.com off until I need it. I'd only run outlook when you need it.

Memory looks ok in this memory display.

R

check here for a driver.

http://gimp-print.sourceforge.net/MacOSX.php

R