Very high CPU usage when browsing MacRumors forum

[Manderby]

Responsive design is a nice thing. But macrumors goes overboard. My CPU usage jumps to 10% just when moving the mouse and 35% for scrolling, let alone loading pages or editing. I have no idea how to say this differently because I know this is not a quick fix and responsive design is such a nice thing and I really like the forum, but please do something about that. Less JavaScript, more CSS maybe?

 

[Gav2k]

Pc specs?

Os??

Browser??

 

[Manderby]

MacBookPro 15" 2012. 2.3GHz i7, 8GB RAM, Mavericks 10.9.5, Safari

 

[Eric5h5]

I can barely get Safari to use more than 1% CPU here. Mostly it's around 0.5% (also on 10.9.5). Probably you have a badly written Flash ad on the page or something.

--Eric

 

[grahamperrin]

… Mavericks 10.9.5, Safari

7.x or prerelease 9.0?

 

[Eric5h5]

Would that even run on 10.9.5? Safari 8 requires 10.10.

--Eric

 

[grahamperrin]

Yes. I use it, and I can not associate use of the CPU, by Safari, with any particular use of MacRumors Forums. I have enabled some debug options that are not normally enabled.

Beyond observations such as those (no observable problem), it'll be inappropriate to discuss the prerelease in public.

 

[Manderby]

This is my everyday computer, no special prerelease software installed. I run Safari 7.1.7

Just uninstalled Flash to test it. No change at all. Turned off extensions completely. No change at all. Even editing in this textbox jumps to 30% CPU usage. I do only observe this behaviour on macrumors.com. The vent constantly blowing gave me the hint that something is wrong.

But I really don't think, this is a Safari only issue. I really believe, the JavaScripts here are a little too jumpy, immediately firing events every 60th of a second even with the slightest change.

Firefox tops at 40%
Chrome easily jumps to 60%
Opera about the same as Safari

Tested it on Snow Leopard as well. Same thing but even higher when scrolling as there is no GPU scrolling.
Testing on El Capitan is slightly better when scrolling. Perhaps due to Metal.

 

[Eric5h5]

Not sure what to say...here's me typing into the text box:

If it was a fundamental problem with the site, it would show up here too.

--Eric

 

[Manderby]

Ok. Don't get me wrong, just trying to help. Here's mine:
Writing text:

Spoiler

Scrolling:

Spoiler

Here are some debug infos of one second scrolling under Mav:

Spoiler

 

[Eric5h5]

I'm not getting any of those errors/warnings. So I'd expect that has something to do with it.

--Eric

 

[redheeler]

Ok. Don't get me wrong, just trying to help. Here's mine:
Writing text:

Spoiler

Scrolling:

Spoiler

Here are some debug infos of one second scrolling under Mav:

Spoiler

How are you booting Snow Leopard on a 2012 MacBook Pro? Did you mean 2011?

I'm not getting any of those errors/warnings. So I'd expect that has something to do with it.

--Eric

Those are just CSS errors and log output. Nothing there should increase CPU usage.

 

[redheeler]

Even editing in this textbox jumps to 30% CPU usage.

Switch to the plain text editor and the CPU usage will decrease. There's even a setting in Preferences to disable the rich text editor.

 

[redheeler]

Not sure what to say...here's me typing into the text box:

View attachment 566890

If it was a fundamental problem with the site, it would show up here too.

--Eric

What are the specs of your Mac?

 

[grahamperrin]

… Scrolling: …

What method?

What model is the Mac?

Makes and models of wired and wireless peripherals?

 

[Manderby]

How are you booting Snow Leopard on a 2012 MacBook Pro? Did you mean 2011?

No, I have two Work-Laptops of 2009 and 2010 I believe.

Switch to the plain text editor and the CPU usage will decrease. There's even a setting in Preferences to disable the rich text editor.

Merci, but I think that's just cosmetics.

What method?
What model is the Mac?
Makes and models of wired and wireless peripherals?

Method: Built-In-Laptop-Trackpad, two fingers. When no laptop: Wired mouse, dragging the scrollbar.
Model: MacBook Pro 2009, 2010 (SL), MacBook Pro 2012 (Mav) and Mac Mini 2011 (ElCap)
No wireless peripherals. All wired.

Now, guessing does not take us any further. Are there at least other people having the same issue? If not, it probably is just my problem. I have no problem admitting this.

 

[grahamperrin]

… guessing does not take us any further. …

Good point.

I'd try two things. First safe boot then a normal boot and retry Safari.

Second – only if the safe boot does not work around the problem(s) – get WebKit.app from http://nightly.webkit.org and then quit Safari before attempting to reproduce the problem with WebKit.

I'd like to suggest more, troubleshooting, but the most suitable open topic is probably not open enough …

 

[Manderby]

Nah, these are wild guesses not worth the time. Remember, I see this on multiple systems and multiple browsers. No offense.

I can live with it. I just wanted to ask the question because sometimes, it is something obvious. Obviously, it isn't. Thanks for all the help so far!