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I'm running High Sierra on my older iMac with 16 GB of ram. I use Safari and I often have 5 or 6 websites open at once. Throughout the day I will very often encounter a website that will produce the following message at the top of the webpage:

This webpage is using significant memory. Closing it may improve the responsiveness of your Mac.

This happens a lot and Safari becomes sluggish on all the other webpages as well. This happens to sites I want to use so closing the webpage is not the best option.

I haven't noticed this in the Chrome Browser but I haven't used that browser very often and would like to continue using Safari. What is causing this to happen and is there a way to stop it?

  • I also use High Sierra, and frequently experience that on my mid-2014 MacBook Pro. – theorist Dec 3 at 1:41
  • Thanks for sharing that. You know how frustrating this can be! – jmh Dec 3 at 2:15
  • Have you isolated any extension? Does this happen in safe boot ? And lastly, try “emptying cache” and deleting cookies and website data. Not history though.. that’d be bizarre – ankii Dec 3 at 16:12

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