I am currently using a 2017 Mac Pro touch bar that is still on Mojave 10.14.6. My safari is consistently shown using significant energy on my menu. In my activity monitor, I noticed there are many apps running behind my safari despite only opening 4 tabs: mailbox, youtube, google and apple stack exchange. Is there any way to remove the apps shown running as shown in the screenshot and to prevent safari from using significant energy? 
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Are you using any extensions ?– ankiCommented Jan 24, 2020 at 10:46
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The window is showing Avg Energy Impact over the past 12 hours. Current impact is almost nil, except for YouTube.– TetsujinCommented Jan 24, 2020 at 10:53
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1 Answer
First off, the high number is the average energy impact, not the current.
This is in line with what you say you currently have open: merely 4 tabs.
Since I don't know what you have been doing before, I can't tell you exactly what might have caused this energy impact. But there is quite some cached Safari web content (Safari is using too much RAM. How can I reduce its memory footprint?, quite old though).
Probably the easiest way to solve the issue is to (force) quit Safari (Activity Monitor → Safari → in the left upper corner X → Quit/Force Quit) and restart your MacBook Pro.
If the problem persists try to delete web page cache with Safari → Preferences → Privacy → Advanced → Show Develop menu in menu bar, then in the menu bar at the top Develop -> Empty Caches.
You can also follow this guide, it also explains how to delete cookies:
Note: Flash Player is a notoriously bad extension (slow and unsecure). If you have it installed, remove it. You shouldn't need it these days. You can read more about it here:
