Apple today seeded build 12D50 of OS X 10.8.3 Mountain Lion to developers, the fifth beta release reports 9to5Mac. The first 10.8.3 beta was seeded back in November, and the third and fourth releases were released in December.

1083
Though the update comes with no known issues or new features, as before Apple has asked developers to focus on AirPlay, AirPort, Game Center, Graphics Drivers, and Safari in their testing. Registered developers can download it via the Apple Developer Page.

Top Rated Comments

lcmazza Avatar
168 months ago
Here's what needs to be fixed:

1. Apple's laziness to launch an OS with so many glitches in their OWN unique hardware.

2. Stop adding BS social features and focus on quality.

3. If Apple wants to add new features, then start copying Windows 8 GREAT file copying and management. That is what desktop OSes do, anyway. This is not an iPad.
Score: 14 Votes (Like | Disagree)
Peace Avatar
168 months ago
I agree with the slow shutdown times. I had a 2007 iMac with Mountain Lion. I put Snow Leopard back on it to sell it.

Mountain Lion: 30-35 seconds to shutdown
Snow Leopard: 5 seconds to shutdown

Even with my newer 2011 iMac, shutdown times are around 30 seconds. It doesn't bother me. I just find it strange. :D

Well see now. Macs aren't used to being shut down or rebooted. That's a Windows thing.

:D
Score: 11 Votes (Like | Disagree)
KattDaDon Avatar
168 months ago
Image (https://cdn.macrumors.com/article-new/2013/01/1083.png)
Though the update comes with no known issues or new features, as before Apple has asked developers to focus on AirPlay, AirPort, Game Center, Graphics Drivers, and Safari in their testing. Registered developers can download it via the Apple Developer Page (https://developer.apple.com/).

GRAPHICS DRIVERS!!!!!!!!!!

I don't get why you re wrote this cause its already there in the article above
Score: 10 Votes (Like | Disagree)
daneoni Avatar
168 months ago
That's what snow leopard was for. Even still lion and mountain lion didn't really get any compelling features. Just social crap and dumbing down of a lot of stuff to make it more like ios (Quicktime being a prime example - they remove most of its preferences for no reason at all)
Quicktime 7 has a 32-bit API that is ancient. 64-bit is the future but taking Quicktime 7 to that future isn't a straightforward process (http://arstechnica.com/apple/2009/08/mac-os-x-10-6/6/) and will take time. And if you owned Quicktime 7 Pro, it still runs just fine on Mountain Lion. Its not like Apple yanked it or 'dumbed it down' for fun-sies. Also social/cloud integration isn't crap, its where we are in contemporary technology.
Score: 9 Votes (Like | Disagree)
3282868 Avatar
168 months ago
Here's what needs to be fixed:

1. Apple's laziness to launch an OS with so many glitches in their OWN unique hardware.

2. Stop adding BS social features and focus on quality.

3. If Apple wants to add new features, then start copying Windows 8 GREAT file copying and management. That is what desktop OSes do, anyway. This is not an iPad.
You can thank Craig Federighi for this as he took over as Senior Vice President of Software Engineering after Bertrand Serlet left in 2011. Serlet moved to Apple with Jobs from NeXT and was Senior VP in S.E., and was mainly responsible for Tiger, Leopard and Snow Leopard. Criag Federighi is a hack, responsible for allowing Forstall to incorporate iOS **** into OS X while dropping the ball on improved graphics drivers and OpenGL Core support, a revised HFS+ Finder system, lack of full multiple display support, "Mission Control", horrible memory management, and pushing for an annual release cycle. The odds are, it won't change.

EDIT Read post #85, as some have called my information into question I have added links and facts to support that Craig Federighi was head of OS X development two years prior to Serlet's March 2011 announcement for departure. Craig Federighi has been head of OS X development since his return to Apple in 2009.

Wednesday, March 23, 2011, 08:35 am
Serlet joined Apple in 1997 and has been involved in the definition, development and creation of Mac OS X. Before his time at Apple, Serlet spent four years at Xerox PARC, then joined NeXT with Jobs in 1989. He holds a doctorate in Computer Science from the University of Orsay, France.

"I've worked with Steve for 22 years and have had an incredible time developing products at both NeXT and Apple, but at this point, I want to focus less on products and more on science," Serlet said.

He will be replaced by Craig Federighi, Apple's vice president of Mac Software Engineering. In his new role, Federighi will assume Serlet's responsibilities and will report directly to Jobs.

Federighi is responsible for the development of Mac OS X, and has been managing the Mac OS software engineering group for the past two years. It was Federighi who gave a live demonstration of Mac OS X 10.7 Lion at a media event last October.

"Craig has done a great job managing the Mac OS team for the past two years," Serlet said. "Lion is a great release and the transition should be seamless."

Federighi worked at NeXT, followed by Apple, and spent a decade at Ariba where he held several roles including vice president of Internet Services and chief technology officer. He returned to Apple in 2009 to lead Mac OS X engineering. Federighi holds a Master of Science degree in Computer Science and a Bachelor of Science in Electrical Engineering and Computer Science from the University of California, Berkeley.
Score: 8 Votes (Like | Disagree)
sshhoott Avatar
168 months ago
Here's what needs to be fixed:
Issues related with Graphic drivers: Choppy Animations, Memory Leaks when apps use GPU/hardware acceleration, Kernal Panics.

Other problems: CRAZY Shutdown times, poor battery life.

Here's what should be added: GPU accelerated scrolling in Mail, Preview (similar to Safari), option to do a three dinger swipe in all apps when it's enabled in Trackpad settings.


Edit: I have a MBP 13" mid 2010. But I've also seen most of these problems on RetinaMBPs
Score: 8 Votes (Like | Disagree)

Popular Stories

Apple Shopping Event 2025

Apple Announces 2025 Black Friday Event, Here's What You Can Get

Thursday November 20, 2025 6:28 am PST by
Apple's annual four-day Black Friday through Cyber Monday shopping event is returning on Friday, November 28 through Monday, December 1 in many countries, including the United States, Canada, Australia, New Zealand, France, Germany, Italy, Spain, the United Kingdom, Belgium, the Netherlands, Sweden, Thailand, and others. During the shopping event, customers can get an Apple gift card with...
iOS 26

iOS 26.2 Adds These New Features to Your iPhone

Thursday November 20, 2025 10:50 am PST by
iOS 26.2 is currently in beta testing. The upcoming update includes a handful of new features and changes on the iPhone, including a new Liquid Glass slider for the Lock Screen's clock, offline lyrics for Apple Music, and more. In a recent press release, Apple confirmed that iOS 26.2 will be released to all users in December, but it did not provide a specific release date. Keep reading...
iPhone 17 Pro Cosmic Orange

10 Reasons to Wait for Next Year's iPhone 18 Pro

Wednesday November 19, 2025 4:00 am PST by
Apple's iPhone development roadmap runs several years into the future and the company is continually working with suppliers on several successive iPhone models at the same time, which is why we often get rumored features months ahead of launch. The iPhone 18 series is no different, and we already have a good idea of what to expect for the iPhone 18 Pro and iPhone 18 Pro Max. One thing worth...
hikawa phone grip stand apple%402x

Apple Launches Second Limited-Edition iPhone Accessory in a Month

Friday November 21, 2025 3:53 am PST by
Apple has begun selling the Hikawa Phone Grip and Stand, a new limited-edition iPhone accessory designed with accessibility in mind. Designed by LA-based Bailey Hikawa to celebrate the 40th anniversary of accessibility at Apple, the grip uses magnets to securely snap onto any iPhone with MagSafe. Apple says it can be removed with ease, and doubles as a stand with two different viewing...
ipad mini 7 feature red and blue

iPad Mini 8: Four Major New Features to Expect

Wednesday November 19, 2025 7:50 am PST by
Apple's eighth-generation iPad mini is highly likely to arrive next year, offering a significant refresh of the device with at least four major new features. OLED Display The next-generation version of the iPad mini could feature an OLED display, as part of Apple's plan to expand the display technology across many more of its devices. Apple's first OLED device was the Apple Watch in 2015, ...
ipad black friday 2025

The Best Early Black Friday iPad Deals

Thursday November 20, 2025 10:20 am PST by
Black Friday is just over a week away, and iPad deals have finally started to flood in at retailers like Amazon and Best Buy. Below we're tracking discounts on every current generation iPad, including lowest-ever prices on M3 iPad Air and M5 iPad Pro, plus steep markdowns on iPad and iPad mini. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a ...
watchos 26 workout app

Apple Watch Users Claim Workout App Is Now Worse in Every Way

Thursday November 20, 2025 7:01 am PST by
Apple Watch owners have been voicing their frustration online over changes to the Workout app that Apple introduced in watchOS 26, with many finding the redesigned interface makes starting exercises difficult and exasperating. When Apple launched watchOS 26 in September, the Workout app went from large, easily tapped workout tiles to a scrolling, corner-button interface. Instead of tapping a ...
applecare apple care banner

Apple Brings New AppleCare+ Options to India

Tuesday November 18, 2025 8:42 am PST by
Apple today announced an expansion of AppleCare+ coverage in India, with new options for monthly and annual plans, and the addition of Theft and Loss for iPhone for the first time. Options for monthly and annual AppleCare+ plans in India provide more choice and flexibility, allowing users to keep coverage for as long as they require. Apple's vice president of Worldwide iPhone Product...
apple wallet drivers license feature iPhone 15 pro

Two More U.S. States Commit to Offering iPhone Driver's Licenses in Apple Wallet App

Thursday November 20, 2025 8:21 am PST by
In select U.S. states, residents can add their driver's license or state ID to the Apple Wallet app on the iPhone and Apple Watch, and then use it to display proof of identity or age at select airports and businesses, and in select apps. Earlier this week, Illinois became the 13th state in the U.S. to offer the feature. Subsequently, we shared a list of additional states that are committed...