Safari: This webpage is using significant memory

I bought my MacBook Air in June 2020, with many hardware upgrades to accommodate the speed of using large programs such as Photoshop (so a website like Facebook shouldn't be a problem). I switched to primarily using Safari a few months ago because Apple touted how much it would "improve battery performance" - but since I've made the switch, Safari runs significantly slower than Chrome (the browser I was using previously) and I get constant "your performance would improve if you close this tab" alerts from literally any website I open, even if it's the ONLY tab I have open (and sometimes it even auto-refreshes the tab, which causes any changes I've made to be lost.....)

I don't understand how Apple's native browser could be riddled with so many performance issues, but I would rather deal with fast battery rundown than the slow browser performance. I'll be switching back to Chrome ASAP.

This message always appears for me if I continue scrolling on Facebook for a while. It gives the impression that new Macs are too slow to handle common webpages. It's extremely annoying and embarrassing for Apple. It says something like closing the page can speed up the computer. (Translated from Swedish MacOS, I don't know the exact words in English.) The only thing that's slowing things down is the need to constantly remove this annoying message. And its not enough to remove it once. It's back again within a minute after I close it. Makes Safari and Mac seem like useless crap, frankly!

Thank you Andre for the link you included. I am using it on a continuous basis and plan on using it again and again until Apple responds by fixing the issue.

There's an even easier fix -- just give us the option to turn this completely unnecessary warning off.

Please, Apple. Please. please. Please!

Big Sur did not fix this

Worse on Big Sur. Having worse problems than on Catalina.

Now it reboots instead of just giving me a banner message.

Running a 2019 MacBookPro.

Same here.

5k on a laptop with 16RAM, i9.

I received this message every single day with just one tab with daily news.

Ridiculous, annoying and really disappointing.

That doesn't work -- this is a newer issue that happens on any web site with video. It started for me after the latest MacOS Mojave/Safari updates which I put in yesterday

Like many of you, I get this message, too, but only on two sites: facebook and Shockwave Unlimited. Getting the message would just be annoying if that is all it was. But if I am in the middle of a game on Shockwave, the page will refresh and all the progress I've made is lost. Grrrr. When I get the message on Facebook, the app is definitely running slow. 2019 iMac Catalina 10.15.7m Safari 14, 16 gigs of Ram. BTW, I also run Excel, Word and several other websites, Photoshop and Acrobat and never get the message on these apps. Only those two Safari pages. I've tried all the steps suggested in the Apple forums and calls to Apple. Nothing helps. I'll probably use Time Machine to install my system from August, which was before this started. =(

I was fortunate to get a customer service person who managed to get my issue escalated to the top of the heap. After 5, 6 phone calls, reinstalling, yadda yadda the engineers read the logs and the reason I was getting these messages on facebook and Shockwave is because they don't have a sort of door on their memory usage like other websites. Big Sur comes out in a few weeks so it's possible the developers of these sites have made the necessary changes to stop this inconvenience by going to the Apple Develop pages. But Shockwave has added a memo on their main page that their site works best with Chrome or Firefox. facebook is just slacking. So come on Big Sur. I am sorry you are having problems; I suspect these problems are for the same reason as mine. TJM Case # 101214630990 =)

For what it's worth, the fix for me was disabling some Safari Extensions. I had previously ruled out extensions causing the issue but after speaking with a senior tech we realized that turning off the extensions and then quitting/restarting Safari wasn't sufficient to disable an extension even though they show in Preferences as off (unchecked). I had to (1) uncheck the extensions, (2) quit Safari and then (3) restart the Mac. After doing this, the memory problem disappeared, so we knew it was an extension.

I have since turned 1Password and Evernote extensions back on with no problems so it's probably Grammarly and/or Honey causing the memory problems.

Hope this helps someone!

Not to be contrarian, just informing in case this helps anyone upstairs wake up to this -- but I don't have a memory problem! I run two extensions -- Ghostery and Adblock. I have (as of my typing right now) 4 gigs of wired memory free out of 16.

And EVEN IF my system was slowing down because I was using too much memory... who cares! Let it! *The warning is worse than the slowdown*. *Let me turn off the warning*. *It is obtrusive and ruining my experience*.