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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

Jan 16, 2012 6:20 PM in response to Crofoot

It seemed clear your point was that what turned out to be a simple fix took a lot of time and a supervisor to suggest. Still, glad you got it fixed. Your experience will help me when I get some free time to retry Lion. Banning 3rd party apps as the problem is a showstopper for me, as a Mac is not very useful without third party apps for real world use. That would be like telling someone not to install anything non-MS apps on a Windows computer if they experience problems, which is weird. I will check out the real memory usage next time. Thanks so much for sharing the help you paid for and worked hard to get to.

Jan 16, 2012 6:30 PM in response to Heathbarz83

I know I didn't give DigitalClips enough credit for the "look for 3rd party culprits first" and should do so.

Mine's not new but I'm pretty sure all new macbooks aren't that slow, as I've heard some good things about the performance of the new ones, running Lion and all.

I can't help but recommend what others are though. Obviously DigitalClips knows more about servicing and assisting with Macs than I do. Have you tried what others are saying, looking at what's hogging the memory and keeping a suspicous eye on third party things that may autostart on login?

I put Lion on a little mini and it ran great, while a MB pro that was twice as fast went crunching to a grinding halt. I hear all kinds of people doing great on Lion so it really is a hit or miss with some programs I think. If you can get a new computer, I'd do it for sure, and not worry one bit "they're all like that". I had a friend who went through three of the original Airs I think, as they kept blowing out, but with his plan Apple took care of him and now he oves his MB.

Jan 26, 2012 2:07 PM in response to jswin

I have found the resolution... After many talks with support (who btw want to charge me since the support package i purchased and never used has expired) none of which resulted in my MAC going back to previous speeds for over a day or 2 i have resolved the issue.

The resolution is a new PC and Windows 7. Yes I loved my iMac while it lasted but Lion does nothing but aggrivate and support will not talk to me unless i pay again for something they messed up. At least I will get a tax deduction when I carry it to Goodwill although I have thought about posting a vid on youtube with my iMac and a little tannerite 8))) bet it goes viral.

Apple had a convert not they just have someone back to trash talking MACs... Sorry folks but i give up...

Jan 26, 2012 2:32 PM in response to PCeeConvert

I run Windows 7, XP, Vista, Snow Leopard and Lion every day. 7 is basically XP and just as bad. They tried to go forward with Vista, failed and stepped back. Meanwhile iOS and OS X are sweeping the board. You are really swimming upstream. Assuming you are serious and not a troll, good luck, you'll need it. What do you use, Android or iOS for your mobile devices?

Jan 26, 2012 3:48 PM in response to Digitalclips

Please forgive my frustration... I read through every one of these posts and nothing new or fixes. I am not sure what a troll is but i am trolling for answers, i assume a troll is not a good thing.

I bought my i7 and was floored, as a matter of fact i was so asstounded I ran out and loaded my portfolio with apple stock! All i run is Photoshop aperature email and web browsers. yes i have MSFT Office for MAC but it stinks.

I thought this was the greatest thing since sliced bread then comes Lion as a mater of fact i purchased and never used appl care which is a testimate to Apple. I couldnt wait and bought it the very first day it was released. My iMac has never recovered. Before responding to your post i opened Aperature and watched the raibow circle spin for 2 mins and 37 seconds. It was almost another 2 mins before i could click without delay.

I am not going to start a MAC PC argument and I do have my MCSE (although it is from probably 12 years ago). Before LION i my brand new PC hardly got turned on I loved this thing for almost a year, now it just wont run.


For mobile i have both...

Jan 26, 2012 5:13 PM in response to Digitalclips

33.04 Mbps on the MAC 33.41 on the PC, the only way i can get faster is FTTH which the do not offer in my area. I have not reverted because i keep hoping for a fix since this OS is supposed to be so great. Number 2 it scares the heck out of me. I know my way around a PC but afraid of getting myself in worse trouble with the MAC.


I may try a fresh install but avoiding that like the plague. All of my programs are soft copy (Adobe Office even Lion were all downloaded) so i will have to locate everything and burn them to a disk and hope i can find all the serials blahh blahh blahh....


At teh end of the day i just whish my upgrade was not such a downgrade....

Jan 26, 2012 7:42 PM in response to Digitalclips

It is not helpful to ignore how Apple dropped the ball with Lion or bash anyone who experiences issues upgrading, or call people names for being frustrated with it. If it was a halfway well thought out upgrade, users wouldn't need to repair their permissions and track down what programs now cause it to crawl after doing an approved upgrade path. This whole forum is a testiment to the fact that aside from the programs that just won't launch after upgrade, which we we expected, some programs that worked fine on Snow Leopard now crawl and kill Lion, not the fault of programs that worked, but an upgrade from Apple that wasn't as well thought out as it should have been.


Windows 7 is no more "basically XP" than Lion is "basically Snow Leopard". It is the perception that all people that use Macs are cultish people that believe Apple can do no wrong, that I fight, when I try to tell people I use a lot of Apple products for a reason. You generally pay more but they are generally better. I didn't find either to be true with Snow Leopard, but I do understand some people quite like it. I still believe the Apple products that are refined, and "just work" are great. To be realistic, I have to admit when they drop the ball. Not giving people support on a product they buy that breaks what what worked great should not be something Apple does, but here we are. Now, if you buy the support, then it falls in line with how I think of Apple. You can buy Lion for cheap, but there's a decent chance it will break what you have and you might just have to buy extra support to make it actually work decent. Thank goodness for this forum and the solutions presented though.

Jan 26, 2012 8:02 PM in response to netsoup

Your comments about Lion are duly noted but they are just an opinion. If Lion was as bad as some indicate the following would hardly be true.


From Apple Insifer: A new study indicates around half of all large companies with 1,000 employees or more are buying Macs.


My instalations on several Macs are now running great after a few initial issues which we related to legacy applications. I have tried to share that information with as many people as possible both on line and with people I know.


Blogs are great but they can feed paranoi ans misconceptionsa, take for instance the blog on this site about how Apple TV 2 and Netflix don't work. Mine works flawlessly so how can there be a basic flaw? Many have an issue and read others do and before long witches are being burned.

Jan 26, 2012 8:12 PM in response to Digitalclips

Not really. "Assuming you're not a troll" was as clear an insult, and the misinformation that XP is Windows 7 seemed a bit odd too, like you take any criticism of Apple personal. They drop the ball sometimes, and you seem suave enough to look up much agreement that Lion is just such a case, if you care to. I did add some people like it great too, but a fair amount do not see the point and are just as frustrated with just the issues many dealt with or gave up trying to fix here, and just reverted back, if they were lucky enough to make a backup. Some just didn't expect such a ball dropper from Apple, and unwiseley I'll admit, assumed they didn't need a backup or that they would need to revert back to keep functioning as they did before.

Jan 26, 2012 8:59 PM in response to Digitalclips

No prob! I type blurry eyed myself and hope people will try to see what I obviously meant rather than focus and nitpick over stupid typos. I do think you gave some really great suggestions to help here. I am extremely disappointed in this "upgrade" though, and I am far from alone. I do know there are those who like it, and the general usability of Macs is great. I just can't blame a user for being mad an upgrade broke their expensive computer when they followed instructions perfectly, and not admitting that it's hit or miss with many apps that worked great under Snow Leopard, and some of the issues can grind the fastest Mac to a halt means more people will do this upgrade without thinking or knowing the decent chance even "Intel based apps" will not necessarily be functional without freezing you up in Lion. Knowing what you're getting into will help people take the smart step of making a backup to go back to SL if it just so happens an App you paid plenty for is a no-go under Lion. I'm not talking about power-pc apps we all knew we'd have to leave behind, but the Intel, modern apps that now freeze up because of how Lion runs them differently. There are many people that are annoyed as heck with Lion versus Snow Leopard, enough so that opinon or not, there's a decent chance you will want to go back on this one. I've read plenty where people are sad to say this is the first Mac upgrade ever, that they're sorry they did, even though there are plenty of people that love it.

Jan 27, 2012 3:12 PM in response to netsoup

Thank you netsoup you are spot on. For me to trade in years of msft experience for a mac they clearly had to be doing something right unfortunately Lion has been all wrong. i am just as comfortable diving in to the windows registry as i am sure dc is diving in to the mac os. i have followed tutorial after instruction and the only way it seems i may get the mac to its original state is doing a clean install and finding all my original disks or creating them and reinstalling everything... yes i was venting and hoping someone had some magical cure that has yet to be discussed.
As far as MAC Insider is concerned, you can make stats say anything you want. I am sure large companies are buying MAC, heck everyone in our marketing, advertising and studio departments use a MAC. BUT on the investment banking side we will never go to MACs because the systems, trading platforms, and other software do not run on the MAC os. AGAIN this is not an argument on which is better it is simply a fact my system is now slower than anything i have owned in years and no one can seem to fix it without a clean install. Not how i want to spend what precious little free time I have.

OS X Lion is incredibly slow (even after index)

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