Webpage is using significant energy on a safari!
Hey!
This webpage is using significant energy. Closing it may improve the responsiveness of your Mac.
How to fix it?
iMac 27″, macOS 10.13
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The fix is to close that webpage. Apparently that page is causing the CPU to be quite busy doing something inefficiently. Possibly some script is going in a needless loop, or the page is loading more-and-more content, or the page has errors that Safari doesn’t know how to overcome gracefully. The fault is likely with that webpage, that only their creator can fix (if they care about Safari visitors at all).