Apple Seeds Build 12D50 of OS X Beta 10.8.3 to Developers - MacRumors
Skip to Content

Apple Seeds Build 12D50 of OS X Beta 10.8.3 to Developers

by

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

180 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
180 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)
180 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
180 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)
180 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
180 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 pro tell logo

Apple Launching Five New Products This Friday

Monday November 2, 2026 1:22 am PST by
Apple is releasing five new products this Friday, November 6, following pre-orders that opened last week, including its first touchscreen MacBook Pro models. The following new products will be available from Friday: iPad mini with OLED display and A20 Pro chip iMac with M6 chip 14-inch MacBook Pro with M6 chip 14-inch MacBook Pro with OLED touchscreen 16-inch MacBook Pro with OLED...
iPhone Duo Display Cracking

Apple Alerts Stores to iPhone Duo's Display Cracking Issue

Friday October 30, 2026 3:20 pm PDT by
In a memo shared with Apple Stores and Apple Authorized Service Providers this week, and later obtained by MacRumors, Apple provided technicians with guidance on how to diagnose and address the iPhone Duo's inner display cracking issue. If a customer reports the issue, Apple advised technicians to inspect the iPhone Duo and repair or replace it in accordance with their standard procedures....
Apple Logo Gradient 16x9 1

Apple Isn't Done With 2026: Here's What's Still Coming

Monday November 2, 2026 7:27 am PST by
Apple's busiest season isn't over yet. Far from it. With two hardware launch dates still to come in November, plus software updates and new smart home accessories running into December, there's more on the way from Apple before the end of 2026, so be sure to stick around. Below, we've rounded up what's still coming, along with one date in particular that's worth watching if you're a holiday...
Latest Stories
iPhone Jailbreak Gets Past Lockdown Mode and Survives an Update
iPhone Jailbreak Gets Past Lockdown Mode and Survives an Update
30 minutes ago
iPadOS 27.3 Expands Siri Mode to Camera App
iPadOS 27.3 Expands Siri Mode to Camera App
2 hours ago
Veterans Day Apple Watch Activity Challenge Launches November 11
Veterans Day Apple Watch Activity Challenge Launches November 11
3 hours ago
Best Early Black Friday Mac Deals: Save Hundreds on MacBook Air, Mac Mini, and More
Best Early Black Friday Mac Deals: Save Hundreds on MacBook Air, Mac Mini, and More
3 hours ago
Apple Fitness+ Gets Gym Strength Plans in iOS 27.3
Apple Fitness+ Gets Gym Strength Plans in iOS 27.3
3 hours ago
iOS 27.3 Adding New StandBy Mode Features to iPhone 11 and Newer
iOS 27.3 Adding New StandBy Mode Features to iPhone 11 and Newer
3 hours ago
Apple Releases New AirPods Beta Firmware
Apple Releases New AirPods Beta Firmware
3 hours ago
iOS 27.3 Beta Brings Apple Intelligence to China
iOS 27.3 Beta Brings Apple Intelligence to China
3 hours ago
iPhone Duo Gets Reachability in iOS 27.3 Beta
iPhone Duo Gets Reachability in iOS 27.3 Beta
4 hours ago
Siri AI Gets More Capable in iOS 27.3
Siri AI Gets More Capable in iOS 27.3
4 hours ago
iOS 27.3 Adds Vertical Tabs and Adaptive Dark Mode to Safari
iOS 27.3 Adds Vertical Tabs and Adaptive Dark Mode to Safari
4 hours ago
watchOS 27.3 Brings Live Rewind and Siri Recap to Apple Watch
watchOS 27.3 Brings Live Rewind and Siri Recap to Apple Watch
4 hours ago
iOS 27.3 Beta Brings Back Apple's Redesigned Health App
iOS 27.3 Beta Brings Back Apple's Redesigned Health App
4 hours ago
Apple Releases First macOS Golden Gate 27.3 Beta
Apple Releases First macOS Golden Gate 27.3 Beta
5 hours ago
Apple Seeds First iOS 27.3 Beta
Apple Seeds First iOS 27.3 Beta
5 hours ago
Apple Releases First watchOS 27.3, tvOS 27.3 and visionOS 27.3 Betas
Apple Releases First watchOS 27.3, tvOS 27.3 and visionOS 27.3 Betas
5 hours ago
iPad Mini 8 Reviewer Dissatisfied With Apple's Excuse for Lack of 120Hz Display
iPad Mini 8 Reviewer Dissatisfied With Apple's Excuse for Lack of 120Hz Display
5 hours ago
iPad Mini 8 Review Claims Battery Life is Way Better Than Apple Says
iPad Mini 8 Review Claims Battery Life is Way Better Than Apple Says
5 hours ago
B&H Photo Launches Early Black Friday Sale With Discounts on Macs and Accessories
B&H Photo Launches Early Black Friday Sale With Discounts on Macs and Accessories
6 hours ago
iPhone Duo Could Take Nearly 30% of Foldable Market in 2027
iPhone Duo Could Take Nearly 30% of Foldable Market in 2027
6 hours ago
Apple Watch Automatically Identifies Songs Playing Around You
Apple Watch Automatically Identifies Songs Playing Around You
7 hours ago
iPhone 18 Rumored to Get Larger Battery and Potential Price Increase
iPhone 18 Rumored to Get Larger Battery and Potential Price Increase
7 hours ago
Apple Store in UK Permanently Closing Later This Month
Apple Store in UK Permanently Closing Later This Month
7 hours ago
Apple's Annual R&D Spending Jumps by More Than $11 Billion
Apple's Annual R&D Spending Jumps by More Than $11 Billion
8 hours ago
Will Apple Ever Merge iPadOS and macOS? John Ternus Responds
Will Apple Ever Merge iPadOS and macOS? John Ternus Responds
8 hours ago
MacBook Neo Gets Rare $30 Amazon Discount
MacBook Neo Gets Rare $30 Amazon Discount
9 hours ago
Hands-On: The OLED iPad Mini is Almost an iPad Pro Mini
Hands-On: The OLED iPad Mini is Almost an iPad Pro Mini
9 hours ago
tvOS 27.2.1 and macOS 27.2.1 Likely Coming Soon
tvOS 27.2.1 and macOS 27.2.1 Likely Coming Soon
9 hours ago
MKBHD Switches Back to iPhone 18 Pro After Testing iPhone Duo
MKBHD Switches Back to iPhone 18 Pro After Testing iPhone Duo
10 hours ago
Apple Explores Cheaper Way to Make New MacBook Pro's OLED Tech
Apple Explores Cheaper Way to Make New MacBook Pro's OLED Tech
11 hours ago