Finder Using Nearly 100% CPU
Solution 1
I think I found my problem—one or more of the files on my desktop.
After moving the various clutter off my desktop, the Finder stopped using so much CPU.
I suspect that it was either calculating folder sizes (as Benjamin Schollnick mentioned) or maybe trying to create an icon preview.
Solution 2
Check Finder --> View --> View Options
If you are viewing a folder, especially one that has subfolders, and you have Calculate Folder Size turned on, the finder will have to go through and "size" all the folders...
I noticed that my Mac Pro will take about a minute or two minutes of nearly 100% usage when I initially turn that on, or if I start viewing the disk from the root.
Try turning that off and see if that resolves your issue... It's a work around, but it'll help isolate the issue.
Solution 3
An easier way to restart Finder is to option-click on its icon on the Dock and choose "relaunch".
This works for a while for me, but the reason behind Finder using so much resources is tick on the box "calculate all sizes" as you said. This takes up much energy especially after major reorganizing/cleaning up the harddrive.
Solution 4
I had Calculate Folder Size on previously and had the problem. Unchecking that box was a workaround but Delete Library/Preferences/com.apple.finder.plist and logging out & back-in seems to have fixed it.
Solution 5
Does this happen as soon as finder is launched? ie. as soon as you login after a restart?
Try opening a terminal and typing
killall Finder
That will quite Finder. Finder will then restart itself. If the CPU usage is still at 100%, then try creating a new user account and seeing if the same happens on that user account. (This will confirm whether or not the problem is with the finder or with something you've done on your own account).
If you still see high cpu usage on the new user account, then something is probably wrong and you should probably call Apple.
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Always Asking
I'm a jack of many trades, and master of several. I've done quite a bit of software development, web development, database work, and some systems administration.
Updated on September 17, 2022Comments
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Always Asking over 1 year
I'm having a problem where the Finder uses WAY too much CPU time. It's using up to 100% of one of my cores.
I'm running 10.6.2 on a MacBook Pro w/ 6GB of RAM, plenty of fast (SSD) disk space. I also run DropBox and BackBlaze.
I've tried disabling my third party stuff (DropBox and BackBlaze), but that doesn't seem to help. It's killing my battery life!
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Always Asking over 14 yearsI tried killing the Finder, but upon restart it would resume taking massive CPU.
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Always Asking over 14 yearsI think that the solution I found points to this being a possible element...
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Dustin over 14 yearsDamaged Icon's have been known to be issues for the Finder, if you have Show Icon Preview turned on as well.
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HikeMike over 13 yearsAll sizes are usually only calculated for open windows, and no big issue e.g. for
/Applications
. It's a really bad idea for the disk root directory, though. -
Tim Keating almost 12 yearsHad a similar issue, tried a bunch of different fixes (removing the finder plist file e.g.) with no results. Discovered I had a large (164 MB) movie file on my desktop, removed it, and my CPU went back to normal.
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Chris Vosnidis over 11 yearsThis issue actually gets worse when editing an image residing on your desktop with Preview. The auto save option introduced with Lion, forces the file into a state where the Finder needs to recreate its preview icon almost every 20sec.
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John Hunt almost 4 yearsThis worked nicely for me where the other answers here didn't. Thanks :)
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Community over 2 yearsYour answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.