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)
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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.