After macOS High Sierra upgrade I noticed "QuickLookUIService" is always in "Using Significant Energy" list. Has anyone have same problem? And is there any suggestion about this?

MacBook Pro (Retina, 15-inch, Mid 2014)

Version 10.13.1


  • This is normal to generate quick look thumbnails and process files in the background. Do you experience this after letting the machine run without sleep for several hours or overnight connected to power?
    – bmike
    Nov 25, 2017 at 21:51
  • Yes. But I tried to restart and it's gone. I guess when I quick look something, it will stuck again. If it will not I will let you know.
    – musa
    Nov 26, 2017 at 16:37
  • I have the exact same machine, but running Mojave, and I've seen this happen a few times. Most recently when I noticed this pop up, my battery dropped to 63% after 45 minutes of use, with nothing else open other than Safari. I don't know what causes it, but logging out and back in seemed to fix it. Just a process running haywire for whatever reason.
    – daGUY
    Apr 14, 2019 at 15:31
  • @daGUY I installed gfxCardStatus app and getting notifications when mac switched graphic card. And I force quit the QuickLookUIService and it's returns back normal.
    – musa
    Apr 15, 2019 at 21:36
  • quicklookuiservice was "fixed" in high sierra. that means that it has lots and lots of bugs. you'll see all sorts of problems with this little program.
    – SMBiggs
    Nov 20, 2020 at 13:33

1 Answer 1


I had the same problem. Here's a suggestion that worked for me, it involves creating a daemon that will kill the service QuickLookUIService every 5600 seconds (you can tune this setting). Whole answer here with the daemon code is here: https://discussions.apple.com/thread/8506070

The one that I had to Force Quit everytime was QuickLookUIService (Spotlight). I'm running Mojave 10.14.6 on a Mid 2012 Macbook Pro 15' non-retina.

In a nutshell, this service is not responding using significant energy and avoiding switching to the integrated graphics, draining your battery until you kill it.

  • Edited trying to stay inside the guidelines.
    – Str4nger
    Oct 7, 2020 at 12:16

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .