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

It seems much better here, scrolling ont the verge too. Not smooth as I wish but much better than before. Try to clean your caches under the library. I can scrool 80 emails under Mail with no problems.

Did they retract the update THAT fast!!!??????

Just updated here. Seems to be working smoother now... let's just wait and see

I wouldn't say blazing fast... but slight speed increase possibly. Mail application when scrolling the actual contents of mail seems a little zippier. However website like the Verge is still slow in safari. Twitter is super smooth and fast however.

Calender app still has that really low frame animation however.

Wouldn't say that it's the user experience I expect still...

Just updated mine. and from my experience my lag can be said 99% gone.. anyway this is just my first impression.. I cannot feel the lag anymore.... let see how it goes in the next few days.

My jittering got back today, on Safari using Intel 4000

The OS seems much more fluid on my 16GB rMBP. Apparently they upped the amount of memory allocated to the GPU to 512MB... Give it 1024MB for all I care. Now if they'd just fix the countless, glaring problems with Safari, I'd have a $2500 laptop that is a pleasure to surf the net on!

Yup, the OS seems better indeed, wake up from sleeping is much faster as well... Safari, tho...

Your saying they allocated 512 (256 more?) to the on-board Intel GPU not the Discreet nVidia GPU correct?  ...Because the Discreet GPU has it's own proprietary memory. No?  Just clairifying, thanks.  And I agree, give it 1024 if that will help.

Is the scrolling judder fixed in Chrome, FF, Opera etc.?  Is Safari the only Browser with issues?

Mine is working better now too....but I swear it's not 100%. But Photoshop is working like a dream! Smooth scrolling at last

I'd actually say mine is worse using it this morning. When I first got the machine playing music in iTunes would randomly start to stutter when I was working. It had randomly gone away, but all of a sudden back again today.

I teach and editing a blackboard site is actually extremly painful just because of how slow everything loads and clunky it is to scroll down a short page... which is ironically smooth to edit on my 5 year old laptop I used to use.

True, they allocated 512mb on HD4000, before was 256mb.

Sorry, but no, it was always 512MB VRAM.

CemY, you're right. Sorry.

No problem Lex1179 :-)

I also can say that is a little bit better, way better is when I open more then 3 Fullsize Apps, go up to 6 "Sites" in Mission Control whithout any lag.

Let's hope that the next update, 10.8.3 make it perfect, becouse in my case I would say it is almost perfect.

Again, sorry for my English.

Best Regards