Some animation transitions are really slow

I'm having exactly the same problems on my MacBook Air, late 2011 (A1369 model) with Intel HD Graphics 3000.

Animations are really laggy.

I noticed lag in almost all UI animations: new share feature, safari show all tabs gesture, show desktop, switching spaces/fullscreen apps, opening mission control/expose, minimize/restore app, zooming screen using ctrl+scroll up/down etc...

Animation in Lion on the same machine were normal.

When you hold Shift and mission control button, to open mission control with animation in slow motion, even than, animation is really lagging.

This animation was really fluid in Lion on the same machine.

Exact same problem for me, 2012 MacBook Air 13" i7. Perfectly fluid under Lion.

This is very annoying, especially as Apple are advertising Mountain Lion as having gestures and animations that "look more natural and fluid".

There's another thread about this issue here:

https://discussions.apple.com/thread/4141958?answerId=19047393022#19047393022&tstart=0#19047393?tstart=0

Same trouble here.

Additionally, notifications either do not show or the display quality is so poor I cannot view notifications.

Exact same problem here for me, 2009 iMac 27 Core2Duo 3,06 Ghz and HD 4670. Might be a graphics drivers issue, when I set a lower resolution it gets a whole better. I have done fresh install on a partition of 60Gb.

Hope Apple fix it, its really annoying, specially in full screen mode and launchpad.

I reinsatalled. Now everything works perfectly.

best of luck. Let us know how if it works.

same problem here. i have an macbook pro 13 mid 2012 with intel hd4000 an crucial m4 ssd. animations are very laggy, for example switching spaces with fullscreen apps. scrolling facebook in safari is horrible. it is a fresh install.

Macbook Air 13-inch, Mid 2011. Same problems. Glitchy expose animations.

They were fine after the initial upgrade to Mountain Lion though.

Try go to 'System Preferences' app, then to 'Sharing'; disable the option 'Screen Sharing'. Make sure its status turns to off. Restart your machine, and you have everything back to normal.

Unbelievable, obviously a lot of people having the same problem like mine. Even, my mbp is the newest one 13 inch 2012 non-retina. It stucks a while when swapping to another full screen apps... really annoying.

This solved it for me:

1. Open Disk Utility

2. Click "Repair Disk Permissions"

3. Restart

4. Download the trial of AutoCAD 2011 or above and run it **

5. Close it.

6. fixed

** I imagine this is due to AutoCAD using some libraries that triggers the fix. I'm not sure what they are, they may be triggered by opening Photoshop CS5 and creating a 3D layer, or maybe launching a game, all I know is that AutoCAD definitely worked.

(I got this solution off another website, but it works.)