Q: Mountain Lion UI Lag on rMBP !!! (Let's Make this thread serious and hope for a fix)

When you say it lags month-to-month, are you talking about when you use two fingers to scroll and it initiates the page curl animation?  Can someone upload a video of this?  I'd like to see how bad it is.

For comparison, here is the page curl on my 2009 MBP: 

http://www.cloudee.com/go#/f/509bb9d88ad6c20d10000087

There really isn't any Judder, but there aren't a whole lot of frames either.  (In other words it's smooth with a low frame rate)  How does the Retina compare?

Also, I have my laptop set to use the more powerful Discreet Graphics card which is obviosly not as good as the 650M in the Retina, but it's better than my on-board chip used for better battery life.

Mine has same lag as others have pointed out & judders when 2 finger scrolling in graphical Safari sites such as www.news.com.au & Mail such as Crackle email newsletters that include movie thumbnails.

Switching to discrete only graphics (GT 650M) does not resolve.  I have logged a job with Apple - escalated to Snr Tech who tested the news site when booted in safe mode & the page would not scroll at all, all graphics fickered.

Snr Tech said he hasn't come accross this prob before & he suspected the fault appeared to be hardware related rather than software. I told him the demo models at Perth Apple Store also suffered from this issue, so obtaining a replacement 15' rMBP may not resolve.

The Tech said such a problem in their new advanced models would be taken very seriously & undertook to further escalate - awaiting response (apparently within 24hrs).

My suspicion is that these machines are not meant to be run upside down.

^ Funny 

Wozz666, did you show the tech this thread or any YouTube Vidoes?  I think they know, they are just tight lipped about it.

I mentioned this thread but he said he didn't follow it!

The tech sent me links to the following at my request:

PRAM & SMC reset - no effect.

EFI update 1.0 - "Alert - the software is not supported on your system"

EFI update 2.9 (latest) - same alert occurred. The tech thought this was due to the update having already been installed.

As I mentioned earlier on this thread the engineers need to rewrite the SMC and EFI updates so that we can reapply them even if they're already installed. 9 times out of 10, a reflash of the firmware will resolve everything.

Here is a video I made this afternoon showing some of the nasty lagged effects, specially when using Safari:

http://www.youtube.com/watch?v=6cIs_89BC40

Some serious tearing and Judder there...  Yikes!

It seems that we've been heard! An update is now out and you can get it here http://support.apple.com/kb/DL1609

or on the Appstore.

I get this when I try to download - http://images.apple.com/support/not_found.html

Try the app store, I just downloaded it and now it works like a charm, is so fast!

Safari is still awful with scroll lag - did nothing for that.. overall UI never bothered me as much as Safari so I don't really notice a change - guess we'll see with time.

The update means that they at least know about the problem and are working on it.

same here... not much different...

Have you tried reseting SMC and PRAM?

http://support.apple.com/kb/HT1379

http://support.apple.com/kb/HT3964