Lightroom slower on OSX Mavericks than on Mountain Lion ??

Just yesterday i heard from renowned Jared Platt that Mavericks is slowing down Adobe products considerably. He has 2 machines and Mountain Lion is WAY faster. Neither Adobe or Apple could help him.
I couldn't find any real confirmation to this on the web. Any opinions, experiences? I want to upgrade from Snow Leopard, and there's a few things that i dont like about Mavericks anyway, so i really consider upgrading to ML. Any comparisons folks? Thanks!
MacBook Pro 8,2 early 2011 btw. Will install 500GB SSD and 16 GB RAM these days.

As mentioned, my iMac is brand new.. UPS delivered it on friday and I've not filled my mac with trash yet. No antivirus, no firewall, no bootcamp and no rubbish.. I have Creative Cloud with LR, PS CC and PS CC 2014 installed. I also have PhaseOne Capture One Pro 7 installed, and its a lot slower than on my older Win workstation.
The thing that struck me is that my external Raid-5 chews on the RAW file 0.1 second, and when its done it takes 10-15 seconds of cpu-action to change from current file to next file, even when 1:1 is built. Same story with CO. Opening print- and web JPEGs in finder takes 2-4 seconds, even if JPEG is less than 5 MB. Activity monitor doesn't help a lot, only that LR is 100% when changing from current to next file. When opening file in finder, only system(kernel?) is at 100% when its "thinking" a lot..
I did manage to slim down LR by moving modules I don't use, and its now usable 'ish.. I removed print, web, book, map and tethering for Nikon and Leaf. I'm might be a mac noob, but I have 20 years behind computers, so I know in my case the bottleneck is the OS, hardware or the application. Any other tips is appreciated
Excuse my poor English, its 02:00am and its not my native language

Similar Messages

HT5568 I cannot update safari to 6.0.2 - I get for months "An error occurred while installing the updates.(103)" every time. I have Mac osx 10.8.2 Mountain Lion. Is Apple asleep?

I have Mac osx 10.8.2 Mountain Lion.
I cannot update safari to 6.0.2. "An error occurred while installing the updates.(103)" every time. I have Mac osx 10.8.2
Is Apple asleep?

If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Select "/var/log/install.log" from the file list. Post the messages from the last installation or update attempt, starting from the time when you initiated it. If you're not sure when that was, start over and note the time.
Post the log text, please, not a screenshot. If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message.
When posting a log extract, be selective. Don't post more than is requested.
Please do not indiscriminately dump thousands of lines from the log into a message.
Important: Some private information, such as your name, may appear in the log. Edit it out by search-and-replace in a text editor before posting.

Mavericks upgrade from Mountain Lion deletes all user accounts

This is a lesson for upgrading too early (and too eagerly).
Today I tried the Mavericks upgrade from Mountain Lion on my 2007 Macbook Pro, after going through all the pre-installation/pre-upgrade checklists.
I don't think I have gone from a very high to a down low in such a short space of time. I really wanted to move on from Mountain Lion and when the installer finished the upgrade to Mavericks and re-started my MBP, I was super excited. When the restart completed and I was presented with the login prompt, I tried entering my user name and password. First time, it shaked on the password... OK, you'd think that is a typo. Re-entering the password... same thing.
You can imagine what ensued. After entering my password v-e-r-y slowly many times, I started realising that something went very VERY wrong.
Just for information, I used two different user accounts on my MBP under Mountain Lion. The one account had administrative priviledges and was only used for installing applications and a few other administrative tasks. Then I have a second personal account, which does not have administrative priviledges and is the account I use daily for Mail, Safari, iTunes, programming etc.
None of those accounts worked under Mountain Lion. Basically, there is no way in.
I then proceeded to boot with the startup option Cmd + S (command-line access). Once that was completed, I was in as root and checked the /etc/passwd. None of the user accounts were there. I was only able to find two user accounts: root and nobody; and a long list of user account that started with an underscore (I think these are some sort of esoteric user accounts). So, it appears that the Mavericks upgrade did not accurately bring over the user account information from my Mountail Lion installation.
Then, I went into the /Users directory and there I could see the home directories for all the users as they were defined under Mountain Lion. The contents were intact too.
It seems to me that the Mavericks upgrade from my Mountain Lion forgot to bring over the user accounts but it did preserve the contents of all the users' home directories.
Unless anyone can spot some sort of user error here (please let me know), I am heading back to Mountain Lion pretty swiftly. Otherwise, I suspect there is a bug in the Mavericks installer.
Any assistance is appreciated.

The reason this occurred is a mystery and has not been commonly reported. Consider the following. It may or may not help. You should probably print these instructions before proceeding.
Boot Single User mode again and do the following:
(You can skip the first step. It will check your boot volume for errors and correct what it can. If there were errors the installer should not have proceeded, but the possibility exists that directory corruption may have occurred during installation. That seems unlikely to me but could explain what went wrong.)
In Single User Mode:
At the :/ root# prompt, type fsck -fy and press Return or Enter. It will take a few moments to complete. If you are concerned that nothing is happening just press the Return key until you see the :/ root# prompt again.
Once the disk check is complete and the prompt returns, type mount -uw / and press Return / Enter.
Type launchctl load /System/Library/LaunchDaemons/com.apple.opendirectoryd.plist and press Enter. If you get an error message you may ignore it.
Type ls /Users and press Enter. All of the usernames on the computer will be listed, which is helpful if you don’t know or remember what these are.
Type dscl . passwd /Users/username password while replacing username with one of the users displayed in the previous step and replacing password with the new password of your choice. Press Enter. You will likely get an error message about a file or directory not being found. You may ignore this.
Type reboot and press Enter.

Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX 10.8.2 Mountain Lion.

Hi!
Didn't know exactly where to direct this question in the Apple Community so I chose Airport. To everyone, thanks in advance.
I’m really desperate. I’m a big Apple fan. I have two Apple MacBook Pro laptops with Mountain Lion software. I also have an Apple Airport Extreme. My HP Photosmart C4780 printer was also purchased from Apple. Anyway, my Internet service is AT&T. AT&T just upgraded my service with a new modem/router (AT&T U-Verse). Prior to the conversion, my wireless printer connection was working perfectly.
Now can’t print wirelessly. For your information, everything is connected via Wi-Fi. The AT&T technician stated that I no longer needed my Apple Airport Extreme, so it was removed. Naturally, after the tech leaves, we find out the HP printer wirelessly no longer works. Thinking that removing Airport Extreme may have been the problem, I reconnected it to the AT&T modem/router, however no change.
This appears to be an HP printer problem. I went to HP community support with the information below but I have received no solutions outside of buying a new printer.
“Ran the HP wireless network test report and it states that HP printer can’t find wireless router and to verify that the HP printer network name (SSID) matches the wireless router network name (SSID) exactly. The Diagnostic Summary in brief: Wireless On & Working & Security – Pass; Network Name (SSID) Found – Fail. Nothing else under diagnostic summary ran. Under Configuration Summary: It shows old SSID name and Mac Hardware Address but no IP Address.
Next ran the Network Configuration Page and everything is enabled except the 802.11 Wireless. It shows status – disconnected. Under general information it states the following: Network status - Offline; Active Connection Type - None; URL(s) for Embedded Web Server – http://0.0.0.0.”
To be straightforward, I’m no computer tech so I don’t know what this means or where to find. The AT&T tech provided me the new SSID Name and a wireless key number but that’s it. Also I uninstalled and reinstalled via USB. The HP message states can’t find router. At this point, I’ve tried everything to reconfigure without success. If I need to make these changes via Airport Extreme Utility 6.0 not easy to find not that I know what I’m doing.
Most importantly if I ever get wireless working again, do I still need Airport Extreme connection or is the AT&T U-Verse modem/router sufficient?
Any direction or help is greatly appreciated. Thank you for listening.

Thank you for your prompt response. I'll be honest I'm a retiree and a newbie to all of this stuff. I don't even know how to do a thread. (Embarassing) This is my first ever contact with the Apple Community so I'm slowly trying to figure this out as well.
As to your thread request, I'm assuming you want to read my post with HP. Not knowing how to thread, I've copied it below.
I have an Apple MacBook Pro laptop with Mountain Lion software. I also have an Apple Airport Extreme. My Internet service is AT&T. AT&T just upgraded my service with a new modem/router (AT&T U-Verse). Prior to the conversion, my wireless printer connection was working perfectly.
Now can’t print wirelessly. For your information, everything is connected via Wi-Fi. The AT&T technician stated that I no longer needed my Apple Airport Extreme, so it was removed. Naturally, after the tech leaves, we find out the HP printer wirelessly no longer works. Thinking that removing Airport Extreme may have been the problem, I reconnected it to the AT&T modem/router, however no change.
Ran the HP wireless network test report and it states that HP printer can’t find wireless router and to verify that the HP printer network name (SSID) matches the wireless router network name (SSID) exactly. The Diagnostic Summary in brief: Wireless On & Working & Security – Pass; Network Name (SSID) Found – Fail. Nothing else under diagnostic summary ran. Under Configuration Summary: It shows old SSID name and Mac Hardware Address but no IP Address.
Next ran the Network Configuration Page and everything is enabled except the 802.11 Wireless. It shows status – disconnected. Under general information it states the following: Network status - Offline; Active Connection Type - None; URL(s) for Embedded Web Server – http://0.0.0.0
To be honest, don’t know what this means or where to find. The AT&T tech provided me the new SSID Name and a wireless key number but that’s it. Also I uninstalled and reinstalled via USB. The HP message states can’t find router. At this point, I’ve read your forum and tried everything to reconfigure without success. Any direction or help is greatly appreciated.
Thanks in advance!
Re: Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX 10.8.2 Mountain Lion.
I finally figured it out! (Sorry that I'm replying to my own posts btw, but I want to post the solution for anybody else with the SigmaplusEOL1 problem). If you have the SigmaplusEOL1 as your SSID when you print the "Wireless Network Test Report", you do NOT need to return it (I know that's hassle for people). To fix the problem, follow these steps.
1) Unplug your printer.
2) Go to your router's IP address (like 192.168.1.1 or whatever it is for your router).
3) Change the SSID of your wirelss network to "SigmaplusEOL1".
4) For the Security option for your wireless network select none (so that a password is not required to access your wireless network).
5) Power your printer back on and reprint "Wireless Network Test Repor". It should say "No problem found..."
6) The report should also have a the IP Address of the printer (under Configuration Summary at the bottom). Type that IP Address in your browser to get to the printer's settings page.
7) Click the "Network" Tab at the top.
8) Under the "Connections" header in the left pane, click "Wireless (802.11).
9) Click "Start Wizard" at the bottom right.
10) In the wizard, change the SSID and encryption (wep or wpsk) password to whatever you want your wireless network to be. So probably whatever it started out as before you changed the SSID to SigmaplusEOL1
11) Click "Finish" at the end. The page will probably try to keep loading but it won't because you changed the network settings of the printer. Just ignore that
12) Go back to your router's IP address and change the SSID and encryption password to whatever you changed the printer's SSID and password to.
13). Reprint the Wireless Network Test Report. It should say the SSID is the same as your wireless, and everything is good.
That's it. You should be good to go now.
Re: Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX 10.8.2 Mountain Lion.
Thank you for your prompt response. This has been a totally frustrating experience. I’ve spent at least 8 hours trying to fix this. My HP problems and your initial steps were identical to mine. I am by no means a tech person and my computer tech knowledge is minimal. However I followed your steps to the best of my ability.
I did get the SigmaplusEOL1 message. I was able to get to Step 6 where the wireless network test report now reads – “HP printer settings do not match your wireless router settings.” So I guess this is a step in the right direction. However unfortunately the Configuration summary message for the IP Address reads – “Not Applicable”. (Note: changing SigmaplusEOL1 to network name knocked out my Internet access. Had to switch back to regular network name to regain access.)
I’m at a loss as to what to do next.   Without the IP Address is it possible to move forward? As I stated earlier, I’m not a tech person. As to your steps 7, 8 and 9, I can’t find them on my computer or maybe I’m looking in the wrong places. In System Preferences - Network, I have none of these steps. If you’re referring to Airport Utility, with the changes in Mountain Lion, these steps are no longer there. If you’re talking about Safari, Firefox or HP, now I’m really lost.
Finally, I don’t know if you can answer this or not. If I ever get wireless working, do I still need Airport Extreme or is the AT&T U-Verse modem/router sufficient?
Again thank you for your time and patience.
Re: Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX 10.8.2 Mountain Lion.
Unfortunately I am unable to offer any further advice as I only followed the instructions listed on the other page.
Finally, as to having WEP enabled, I don't know. Don't even know where to look. The best that I could determine is that my security is WPA/WPA2 Personal.
I'm truly sorry about all of this. Thank you for your time and patience. After reading all of this and you change your mind, I would understand.

How do i change from OS-X mavericks back to mountain lion

how do i change from OS-X mavericks back to mountain lion i dont like maverick and i want to go back to snow lion BUT I want all my stuff (pictures, docs, ect.) im running bootcamp with windows 8 also, and dont even work or load, it just keeps looping or restarting windows updates

Here's a reference: How to revert OS X back from Mavericks: Apple Support Communities

I have really slow internet, i bought OS X mountain lion & tried for days to download it. my internet cuts every time & the download restarts from the beginning is thr a way to download the software as a "zip" file or from a link not app store?

I have really slow internet, i bought OS X mountain lion & tried for days to download it. my internet cuts every time & the download restarts from the beginning is thr a way to download the software as a "zip" file or from a link not app store?

MacBook Pro
https://discussions.apple.com/community/notebooks/macbook_pro
https://discussions.apple.com/community/mac_os/mac_os_x_v10.7_lion?view=discussi ons
http://www.apple.com/support/macbookpro
Take it somewhere that has better broadband. The best you can do sometimes is invest in new modem that works with your system instead of the rental etc in most cases.
Do a Safe Boot.
Make sure your firewall is set properly. Don't use 3rd party. AV software can get in the way.
Make sure you are getting the service and a clean strong modem signal - slow is one thing but if it drops off and can't maintain a connection you have hardware issues, not software - and upgrade to a new OS doesn't tend to improve, it may even not work with older networking equipment once you do get it.
I agree and think electronic only goes too far. And when you do get it: burn the package and manually set it aside first before running the intaller! make a flash memory installer, put it on DVDs too.

After done the Mavericks update from Mountain Lion, I can't no more extend my applications to the second screen. Can somebody help me ??

After done the Mavericks update from Mountain Lion, I can't no more extend my applications to the second screen. Can somebody help me ??

Check here:
System Preferences > Mission Control > uncheck Displays have separate Spaces > Log Out ( >Log Out <user>) > Log back in

How do i uninstall Mavericks and reinstall Mountain Lion (no disk)

how do i uninstall Mavericks and reinstall Mountain Lion ( i dont have the ML disk)

See https://discussions.apple.com/message/23482513#23482513

Free Upgrade to Mavericks and not Mountain Lion?

I noticed I have a free upgrade to Mavericks. However, the application I'm using that prompted the search for the upgrade doesn't support Mavericks, I need Mountain Lion and I can't find a free upgrade to it anywhere. My question is; Why do I have a free upgrade to Mavericks and NOT Mountain Lion?
Thanks much!

Yeah I noticed it's there for purchase, pretty inexpensive as well $20. But I was just curious as to why the newer version is free and I can't find Mt. Lion for free, and that's the one I need. Maybe I'm not looking in the right place or it's just unavailable?

I'm running OSX 10.8.5 Mountain Lion. What version of QuarkXpress and Microsoft Word run with this level?

I'm running OSX 10.8.5 Mountain Lion. What version of QuarkXpress and Microsoft Word run with this level? My older versions are no longer supported.

Hi Jrehoboth,
please see here: http://forums.quark.com/viewtopic.php?f=14&t=4608
At the bottom of the post we summarized which version you can run on each version of OS X:
So if your operating system is OS X Mountain Lion (10.8) then you can use QuarkXPress 9 & QuarkXPress 10 and soon QuarkXPress 2015.
Thanks
Matthias

How to uninstall maverick back to mountain lion?

I have instaled maverick but have found that it does not support some programs so wish to revert back to mountin lion. Is this possible and if it is can you give me a very basic explenation of how to do so.
Many thanks

Another option too for those (kind of like me) who never did the time machine.
I just restored my computer back to Mountain Lion, and she's working perfect again, as I knew she would. E-mail popping into mailbox instantly as it should and did before the update, printer working fast as it was before update, no more freezing or glitches of any kind thankfully and finally. Here is the link that is through the Apple site to direct you on how to put your system back and get rid of Maverick's, that is assuming that is what you would like to do and also includes link for those wanting to try fixing the issue if that is your preference (most of this info is for those with mountain lion and some with the previousverisoin of OS X lion).
If you want to keep Maverick's here is a good post on the apple discussion board to help you out:
https://discussions.apple.com/docs/DOC-6161
If you just want to totally get rid of it and put back what you had before, this is the short version of how to do so:
https://discussions.apple.com/docs/DOC-3353
NOTE: This particular link has a lot of info on what to do for different situations, it is a bit lengthy, yet still very helpful.
OS X Mountain Lion: Reinstall OS X (direct from Apple support site, not someone else):
http://support.apple.com/kb/PH10763?viewlocale=en_US
OS X: About OS X Recovery (also from apple support directly and includes some instructions just the same as previous links above):
http://support.apple.com/kb/HT4718
Just in case you aren't sure what it will all look like as you are doing things, this is a link to show you a few pics of what you will see as you as you are going through the process, it can be helpful for those who aren't sure what they are doing or how to do things at all:
http://www.apple.com/osx/recovery/
This is a way to download the Mountain Lion disk info from the server
http://support.apple.com/kb/DL1433
I hope this helps someone, it was amazing for me and my system is working perfect again like it was, battery life is way better went from like 3 hours to like 5 (not on full charge by the way, after it sat for a while doing the online update which took a while so that's saying something alone, huge improvement). I plan to wait a while before attempting to reinstall Maverick's, long enough for them to fix the bugs.

Why is my wifi slow on Windows 7 and not Mountain Lion?

I have Windows 7 installed through boot camp. I purchased my MacBook Pro new 2012. When I use wifi in Mountain Lion, it works great. When I boot into Windows 7 I get SUPER slow speeds. OSX I get full speed at 60 Mb/s. Windows I get 1 Mb/s or lower. I updated OSX, and windows 7. I have an Samsung SSD 840 Pro and everything is running incredibly fast. I just need the wifi fixed. I also purchased an Airport Extreme about 2 months ago, latest version. Airport Utility is also up to date. Please help!

Try a different cable. And are you connecting directly to your computer or through a USB hub?

Where can I download OSX Mavericks to upgrade from Lion?

I have an Early 2011 Mac Pro 17" and have just acquired an Apple TV - but hey presto Lion does not support mirroring - whereas Mavericks does!!
So short of upgrading to Yosemite (mixd reviews...!!!) I was hoping to upgrade to Mountain Lion or Mavericks??
Anyone know where I can get Mavericks from?
thanks

If you have never purchased OS X Mavericks before under your Apple ID, then it is no longer currently available.
OS X Mountain Lion is still available on the Mac App Store, but you must purchase a special email download code to download and install it from the Mac App Store.
Before embarking on a major OS upgrade, it would be wise, advisable and very prudent if you backup your current system to an external connected and Mac formatted Flash drive OR externally connected USB, Thunderbolt or FireWire 800, Mac formatted hard drive. Then, use either OS X Time Machine app to backup your entire system to the external drive OR purchase, install and use a data cloning app, like CarbonCopyCloner or SuperDuper, to make an exact and bootable copy (clone) of your entire Mac's internal hard drive. This step is really needed in case something goes wrong with the install of the new OS or you simply do not like the new OS, you have a very easy way/procedure to return your Mac to its former working state.
Then, determine if your Mac meets ALL minimum system install requirements.
To install OS X 10.8 Mountain Lion, 10.9 Mavericks (currently unavailable) or OS X 10.10 Yosemite.you need one of these Macs:
OS X 10.8 Mountain Lion purchased emailed download code here.
http://store.apple.com/us/product/D6377Z/A/os-x-mountain-lion
iMac (Mid-2007 or later)
MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
MacBook Pro (13-inch, Mid-2009 or later),
MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
MacBook Air (Late 2008 or later)
Mac mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009)
Your Mac also needs:
OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
2 GB or more of memory (I strongly advise, at least, 4 GBs of RAM or more)
8 GB or more of available space
Next,
If you run any older Mac software from the earlier PowerPC Macs, then none of this software will work with the newer OS X versions (10.7 and onward). OS X Snow Leopard had a magical and invisible PowerPC emulation application, called Rosetta, that worked seamlessly in the background that still allowed older PowerPC coded software to still operate in a Intel CPU Mac.
The use of Rosetta ended with OS X Snow Leopard as the Rosetta application was licensed to Apple, from a software company called Transitive, which got bought out, I believe, by IBM and Appe could no longer secure their rights to continue to use Rosetta in later versions of OS X.
So, you would need to check to see if you have software on your Mac that maybe older than, say, 2006 or older.
Also, check for app compatibilty here.
http://roaringapps.com/
If you have any commercial antivirus installed and/or hard drive cleaning apps installed on your Mac, like MacKeeper, CleanMyMac, TuneUpMyMac, MacCleanse, etc. now would be a good time to completely uninstall this apps by doing a Google search to learn how to properly uninstall these types of apps.
These types of apps will only cause your Mac issues later after the install of the new OS X version and you will have to completely uninstall these types of apps later.
Once you have determined all of this, you should be able to find the latest versions of OS X by clicking on the Mac App Store icon in the OS X Dock and then login to the Mac App Store using your Apple ID and password and if you purchased a download code, input that code.
You can then begin the download and installation process of installing the newer versions of OS X from the Mac App Store.

Going from Mavericks back to Mountain Lion, how do I download the correct software versions from app store for apps like iPhoto etc.

I have a somewhat older iMac and after installing Mavericks the computer slowed down and the harddrive died. I just got a new harddrive installed and they had trouble getting mavericks to work on it also so they installed Mountain Lion which I am pleased with. I have purchased apps from the app store such as iPhoto and Pages, etc. so I thought I would easily be able to download them for mountain lion. When I look for the apps to download on the app store it lists the versions I had with Mavericks. iPhoto for example says I can download it for free but in the compatibility sections it says it requires OS 10.9 or later. Where can I find and install versions of my software such as iPhoto and iLife that will work again with Mountain Lion?

Try downloading an app. There are those here who believe that the MAS will determine that you have OS X Mt Lion and actually download the app that your kit needs.

How do I go about downgrading from Mavericks back to Mountain Lion? I do not have an installer as ML shipped with my Macbook.

I would like to re-install ML as I have a few issues with Mavericks that really annoy me when I am using my Mac now. I just need to know how I can downgrade back into ML without having the installer file. I cannot reach it in the appstore or on my purchased list because I never actually had to buy it since it shippd with my Mac. Thanks for the help!!

Install Mavericks, Lion/Mountain Lion Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer.

Lightroom slower on OSX Mavericks than on Mountain Lion ??

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