Webpage using significant energy / memory on Mac

It is the new Safari updated with 10.13.x-10.13.4, everything is working as it should. I do not notice any slow down or disruption to Safari in all honesty, besides the pop-up banner. This may be a clue that Safari is working as efficiently on your behalf to keep things running smooth behind the scenes.

Ignore the warning if you wish, or excuse it by the x. There is absolutely no user harm either way. I suspect if (like before the new Safari) you did not get the warning, you would be non-the-wiser.

Just because Safari is "made for Mac," it has no control over half baked code a website is running. (Maybe that would be the better warning message.) A resource intense interface. As you can imagine CNN, Facebook run some realtime API's that not all rendering engines interpret in same way. This is by design or there would be no difference or need for different browsers. Think of it this way that warning message keeps people employed. 😉

If this troublesome warning message popped up on every other website—then yes Safari has a problem. It simply is not case, from your post, other post on ASC, or my own user experience.

By all means send Apple Feedback http://www.apple.com/feedback/

Please note I am not an apologist for the Safari.app I just see it as a non-issue. Surely there are bigger fish to fry.

Hmmm, well I hope you are able to get resolution. My error message has gone away though. The only things I did were clearing the cache on Safari, installing the security update that apparently Canada gets a week later than everyone else:( and, since I was only getting the error on msn.com, I contacted them through their feedback button to let them know of the issue

So after suffering this problem for the past 12 months I believe I finally know what is going on. It's not the browser, it's the system and how it uses or doesn't fully support OpenGL which some websites still use. OpenGL handles the graphics on the computer in particular games and videos.

The OpenGL deprecation

Apple's developer documentation advised that active development has ceased for OpenGL and OpenCL on the Mac, and that the APIs will only get "minor changes" going forward.

"Apps built using OpenGL and OpenCL will continue to run in macOS 10.14, but these legacy technologies are deprecated in macOS 10.14. Games and graphics-intensive apps that use OpenGL should now adopt Metal. Similarly, apps that use OpenCL for computational tasks should now adopt Metal and Metal Performance Shaders," the company noted.

In software, "deprecation" means that a feature has been superseded and that while the old version should still work for the time being, it's advised to stop using it moving forward and to prepare for a future where it is removed entirely.

Click your Apple menu  top left in your screen.

From the drop down menu click Force Quit then select Safari then click Force Quit.

Then relaunch Safari.

Was the second user an admin user?

Also, in Safari Preferences, select "Advanced", check "Internet plug-ins" to stop plug-ins to save power.

Do you try disabling all your extensions to see if that helped?

I gave up.

The message is true though. I solved my problem by installing Chrome. No more Safari messages for me!

Hi everybody,

For the Netflix users try to use Friendly Streaming app. For me it was the solution.

Same here. This began fairly recently. I have no Safari extensions, I have no apps that didn't come from the App Store. i have no keepers or cleaners and my etrecheck showed that my mac performance was excellent. I usually get this message when I'm on CNN or CBS and there is a video accompanying the news story. I've never had this before. I've been thinking I was hacked but obviously others here are experiencing this too.

Those of us here complaining obviously don't consider it a non-issue, and telling people who are bothered by it that you disagree does not provide any help in resolving the issue.

All standards-compliant rendering engines have no problem with Facebook or MSN, and though I haven't worked on those sites myself I'd venture an educated guess as a web developer that neither of them use any "half-baked" code. I know Facebook in particular does enormous QA and staged rollouts of new features to catch any problems early.

This is a Safari issue. The solution is to use a different browser.

With the many glitches in Safari, including this one, like videos that don't work, etc, the perfect solution is to IGNORE Safari and make another browser your default. Why should we constantly be obliged to go through IT gibberish hoops, especially when most people are NOT IT, just to have a browser that doesn't work without any problems?

Frogmom09 wrote:

I realized I do not have the "Develop" option as part of my Safari.

If you don’t see the Develop menu in the menu bar, choose Safari>Preferences>Advanced> “Show Develop menu in menu bar.”

https://support.apple.com/guide/safari/use-the-safari-develop-menu-sfri20948/mac

All the reponses here to get rid of the problem are temporary at best and most are just plain useless not helpful sorry. I know the intentions to have a work around are good but this is an Apple created problem and needs to be addressed by their software engineers. I have been in the genius bar twice and called Apple support twice and still no resolution even with a senior advisor. Very sad how unresponsive Apple is for the price we are paying for these MACs. Let's see if this even gets posted as Apple has censored my other posts for not giving any technical advice. So here is my technical advice folks: use Chrome web browser and wait for a software update (you could be waiting a very, very long time).

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.