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OS X Lion is incredibly slow (even after index)

I've installed Lion on my iMac (24-inch, Early 2008, 3.06GHz Intel Core 2 Duo, 4GB RAM) and it has become INCREDIBLY slow. I've heard many people saying that the machine would return to its typical blazing speeds after indexing finished, and it has — I've left it on overnight a couple of times to make sure everything finished, and it's still much slower than it was while running Snow Leopard. Virtually every application hangs — when typing in Finder (for example to rename a folder) the text lags several seconds behind what I'm typing. Mission Control is terrible — the graphics lag behind and it takes several seconds for the animation to finish. Often the animation doesn't appear at all, and it just flickers between frames awkwardly until the mission control display finally appears.


I'm working on backing up all my data and doing a clean install … I'll see what happens, but if it doesn't work I'm going to have to roll back to snow leopard, because this is ridiculous. I've never seen an OS change slow down a machine so much since Vista … hopefully it's fixable. Any thoughts on what might be the cause?


(Oh, and activity monitor scans look normal … nothing's hogging the CPU, and there's slightly less than 2GB of RAM free almost all the time.)

iMac Core 2 24, Mac OS X (10.7)

Posted on Jul 23, 2011 11:59 AM

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288 replies

Feb 5, 2012 7:24 AM in response to Csound1

Yes that is incorrect. I have an MBPro with I7 2.66 8GB Mem and 512GB SSD, bought it end 2010.


Now, since recent:


Open Mail: Rainbow wheel and like locked for 15 seconds spinning. (annoying)


Some apps as well are more slow then before. (rainbow wheel)


What is going on? I ran verify disk repair disk repair permissions, even resetting P and V Ram.


And in recovery mode, reinstalled lion. Still same. Lion has very nice features but it's broken. (Starts having issues like a regular windows machine, which is horrific)


Am I too paranoid to ask if MSFT pays coders on the side to deliberately screw up the OS?


Starts to look like it. I've become a Mac Fanatic since 2006 and this is really not normal Apple behaviour.

Feb 9, 2012 4:16 PM in response to Leslill

Finally progress and showing signs of life again!


1) removed and reinstalled FireFox (thank you for that suggestion)

2) Purchased MacKeeper and toasted everything it suggested

3) Purchased 16GB of RAM (quadrupled it)


I am back to almost pre-lion speed


I will withhold full judgement. I have been here before and 3 days later i was crawling again but i am hopefully optimistic. Maybe i wont have to make my PC my graphics computer after all 8)))

Feb 9, 2012 5:07 PM in response to Digitalclips

dunno, i was desperate and probably wasted money... guess i should have asked in here first... i am still learning my way around the mac and it does a good job of cleaning all the various cache. would i purchase it again, probably not just listing everything i did.

i did see an increase in speed post FF reinstall but still got the twirling rainbow ring of death on occasion.

RAM may be the real winner. I am making the assumption Lion is much more of a hog than the old system. At the end of the day i have made it 24 hours without wanting to stick my fist through it. that alone make me smile 8)

Feb 17, 2012 12:02 PM in response to jswin

So after reading through this message thread, I just wanted to share my experience. I know that the last message posted here was a few days ago but it looks like this message thread was started in July 2011.


Anyways, I have a Macbook Pro early-2011 with 8GB DDR3 RAM and almost all upgrades available. It's a pretty snappy system. I'm a Web Developer and Programmer, so I'm on my computer just about all day and non-stop for that matter. A few days ago I noticed that when I did a reboot, it would take 4 to 8 minutes (timed) to boot from shutdown to the login screen then an additional 3-5 minutes after logging in to be able to do anything.


I've always been a Linux fan and have used all 3 major systems through-out my career (Mac OSX, Windows and Linux) so I started with what I was familiar with. (These are the steps that I did to speed up my Macbook Pro without having to re-install or do anything drastic).


  • Shutdown Computer
  • Hold Command+R and press the Power Button
  • Once booted into Lion Recovery, select 'Disk Utility' and select 'Continue'
  • I then clicked 'Repair Disk'
  • Once complete, click 'Repair Permissions' (All in all, depending on your Harddrive Size and Speed this process can take 10 minutes to 50 minutes-- just depends on size/speed and how damaged the permissions and disk are).
  • Reboot computer
  • Now, I'm not a huge fan on these Applications but load either CleanMyMac, CleanGeniusPro, iKeeper or iBoostUp and run their utilies to clean your System Cache, Uninstall Applications that you do not use, Uninstall all unused Widgets, System Preferences and Plugins.
  • After any of those Applications are finished running, you can restart your computer


So basically, as mentioned in the comments of this message thread, run Repair Disk and Repair Permissions followed by Cleaning Up your system. If your still having issues, I would recommend following up with Apple or if your "Techy Savvy" then you can look at the Logs and see what's slowing down your system. I can say that I've seen specific Apps that work with the System Kernel bog down a computer. There are many variables to why your computer may be as slow as it is. As fresh install tends to work but should be your last resort and if your still having issues with sluggish systems after a fresh install then it probably (might be) your hardware.


Hope that summary helps someone.

Feb 17, 2012 3:05 PM in response to WigglyWaggly

i tried EVERYTHING and repairing disk permissions only worked temporarily, i think FireFox (i uninstalled and reinstalled) was part of the issue but upgrading to 16 gig of ram from the 4 gig it came with made a huge difference. Lion must be a real hog and i honestly cant say i like it better not can i say it is faster than it was before (possibly slower) even by quadrupling the RAM???

Feb 17, 2012 3:12 PM in response to PCeeConvert

Lion does take up a little more memory than Snow Leopard did but not enough to where upgrading to 16GB RAM is neccessary. The technology behind OSX seems to be slowly moving towards how Ubuntu did Unity, with the goal of being able to run on Tablets and low resource Devices. I would be curious to see your log files to see what is acutally going on behind the scenes. If you can goto your System Preferences -> Users and Groups -> Startup Items and remove startup Applications that you don't need or use and then if you can post your All Messages (via Console.app, then Command+Shift+S. You can post it on Pastebin and post the link here).


Maybe we can figure out what is actually going on behind the scenes and troubleshoot your system that way. I've found that running just ruitine maintaince works and if that does not work then it's an issue with a particular application and if that is not the issue then it's hardware.

OS X Lion is incredibly slow (even after index)

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