Since Mojave Upgrade iTunes 100% CPU

MagnusVonMagnum

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Jun 18, 2007
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I installed a 2TB SSD in my 2012 Quad i7 Mac Mini and upgraded from 8 to 16GB of ram. I went ahead and installed the Mojave upgrade (from El Capitan) and since I got rid of the dual RAID config, I created a Win10 BootCamp partition (used my old unused Win8.1 Pro key I bought on sale for $68, which will register Win10 Pro). Everything seems to be hunky dory, overall. Both OSes boot in 20-25 seconds and the machine feels almost like new again (maybe better in terms of disc access).

BUT, the one problem I've been having consistently since upgrading is that when I start iTunes now, it goes to 100% CPU usage (11% total) when it starts and stays there for ??? Hours? If I leave it there and go to bed the next morning it'll be down to normal CPU usage for iTunes, but if I quit it and restart it, it's right back to 100% for hours and hours again.... WTF!?!? What is it doing??? I haven't watched a movie or played a music file or done a darn thing with it. If it's updating some files or something, it should have been done when I left it overnight, etc., but here I'm sitting 10+ minutes after starting it and it's STILL at 100% CPU.

This is absolutely unacceptable behavior. And the weird thing is that I'm pretty certain it did NOT have that problem in El Capitan. I would have noticed like I did here. So why would it change just going to Mojave? Did Mojave have a newer version that was not available for El Capitan? I forget what version it was at, but checking now it's at v12.9.5.5.

I've mostly moved to using KODI 18.3 Leia over SMB3 for all local media (I've got three AppleTV units in use for streaming), but I still get a hiccup with music once in awhile that doesn't happen with iTunes (and it never happens if I use Windows 10 to serve the music to KODI so something is amiss in macOS there as well) to my AppleTV units so I liked to leave it running, but not if it's going to use that much CPU power doing nothing.

Is anyone NOT having this issue with iTunes in Mojave? Could something be messed up after the upgrade? Media plays just fine from Mojave and even as old as my Mac is, I can't "feel" anything slow in iTunes itself, but the Activity Monitor doesn't lie.

I've been watching the Disk and Network use and it's not using either. So whatever it's doing at 100% CPU is just within iTunes itself and isn't using any disk or network activity.... weird.
 

casperes1996

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Jan 26, 2014
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Horsens, Denmark
Is anyone NOT having this issue with iTunes in Mojave? Could something be messed up after the upgrade? Media plays just fine from Mojave and even as old as my Mac is, I can't "feel" anything slow in iTunes itself, but the Activity Monitor doesn't lie.

I've been watching the Disk and Network use and it's not using either. So whatever it's doing at 100% CPU is just within iTunes itself and isn't using any disk or network activity.... weird.

Never had the issue on Mojave, never heard of it before either. I'd recommend deleting the iTunes Library and recreating it with the same media as a beginning.
 
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MagnusVonMagnum

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Never had the issue on Mojave, never heard of it before either. I'd recommend deleting the iTunes Library and recreating it with the same media as a beginning.
I rebuilt the library and you were right, that seemed to fix it. :)
 

MagnusVonMagnum

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Good to hear :)
Well, it's back up to 100% again. No idea. I had forgotten to turn Home Sharing back on after building the new library and when I went to play music from an AppleTV across the network, I realized it was off. I turned it on and now it's back to 100% CPU use. I turned it back off and it's STILL at 100% CPU use. The only way I can see to get it back down is to just turn off iTunes period and never use it again. Garbage software as far as I'm concerned. But then I never had this problem with El Capitan so who knows....

EDIT: Turning off all home sharing didn't stop it, but turning off PHOTO SHARING did. I did notice it was taking 10+ minutes to just load a list of my photo folders from my 2nd Gen AppleTV when I turned on photo sharing. Apparently, it cannot handle thousands of photos to share. I'll use KODI for that.... Why that uses 100% CPU use, though. Again, no idea. What's it doing?

One of the first things I did when I installed Mojave was to wipe out my Apple photo library entirely. It was running that facial recognition GARBAGE and from what I read online it would take it over a month for the size of my photo library and I NEVER even use that library anymore and NEVER ONCE used the facial recognition thing. WTF Apple does this garbage is beyond me. Give the users some options for god's sake. My option is to not use Apple apps... they just suck anymore. I don't remember their software being so cruddy in the days of Snow Leopard.
 
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