Webpage using significant energy / memory on Mac

Safari/Preferences/Extensions and remove the checkmark from all extensions. Test. If it fixes the problem, add the checkmark back 1 by 1 until you find the extension that is causing the problem.

I did that as I'm experiencing the same issue and it did not resolve the problem.

I have this question, too.

I have it too. I don't like it. Tried everything above. Only since the update. APPLE- this is not a feedback suggestion. Please fix the issue. For the price of a Mac is the best they can do?

Try the new Security Update 2018-001. It should be available as an update in App store. I just updated and the error seems to have gone away.

I installed update on 4/24 and it did not fix the issue. I have a brand new 27" iMac.

This is a new Security update that just came out today. It is seperate from the update to version 10.13.4.

"I opened "Develop", "Experimental Features" and unticked "Cache API""

Not being a tech, I have no idea what that means or how to do it.

At the top of the Safari browser is a tab named “Develop” If you don’t have that go backwards through the thread as someone posted on how to add it to tabs.

Sadly, the issue came back today while on FB.

same issue all same same same. Frustrated .. absolutely was with recent update.

A simple fact that people read articles that may pertain to them and ignore the rest and, like a child, you go off about me not reading millions of articles. Go back to Facebook.