Lightroom 2.5 very slow

After upgrade to 2.5, LR seems very sluggish. Below is the data from Help/System Info. Any suggestions? I'm not sure why Virtual Memory Used is so high. Is this a setting I need to change somewhere? Thanks for any suggestions.
Lightroom version: 2.5 [605155]
Operating system: Microsoft Windows XP Professional Service Pack 3 (Build 2600)
Version: 5.1 [2600]
Application architecture: x86
System architecture: x86
Physical processor count: 2
Processor speed: 3.1 GHz
Built-in memory: 2045.4 MB
Real memory available to Lightroom: 716.8 MB
Real memory used by Lightroom: 56.8 MB (7.9%)
Virtual memory used by Lightroom: 667.0 MB
Memory cache size: 15.4 MB
Serial Number: 116040047072344008313625
Application folder: C:\Program Files\Adobe\Adobe Photoshop Lightroom 2.5
Library Path: C:\Documents and Settings\Tina Blum\Desktop\Tina's Photo Studio\Lightroom Backup\2009-10-31 1824\Road Trip, 2009.lrcat

Some depends on what you're doing, and whether you've recently imported a lot or not. Can you describe more?
Other comments: You are light on RAM in general, but should be able to run LR ok under most circumstances. Are you using the backup catalog for some reason? Also, in general, it is wise to avoid commas or slashes or other such characters in file or folder names. The path to the catalog seems very long, but I don't know if that alone can affect read/write speed on your platform.

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Lightroom 4.4 very slow - tried everything

Hi all...
Lightroom 4.4 is very slow for me... everything takes longer than it should and it's driving me nuts. Can anyone help?
Some details:
I have LR 4.4 on a Macbook Air. I have two libraries:
Internal - 5,000 photos
External Drive - 21,000 photos
My external drive is not connected and I am working with photos on the internal drive... so it's only 5k photos.
I've already tried all of the troubleshooting tips:
Purged camera raw cache
Increased camera raw cache to 3GB
Purged video cache (even though I have no video files in LR)
Deleted all previews (8GB worth)
Optimized catalog
Restarted LR
My Macbook Air has 30GB of memory free.
Any suggestions? It's driving me nuts.
Thanks!

I can now report from both sides of the fence. Up until yesterday, I had a four-year old Core2Duo system, 8GB, that had the dreaded slowness. Not as bad as described above perhaps, but there was clearly something not working as it should. Using matrix-based monitor profiles and updating video card drivers relieved some of the symptoms, but the disease was still there.
At the same time I used an i5 16GB system that was much better. Not good (as in instantaneous), but acceptable.
This morning I fired up my new system for the first time and sent it on its maiden voyage. Naturally the first thing I did was open Lightroom 4.3, and...yes. So that's how it's supposed to work! Snappy, immediately responsive, switching images like nothing ever happened.
Phew.
Now this is a pretty high-spec'ed machine, i7-3820, Asus P9X79 pro, 32GB, SSD. Let's not hope these are the real requirements for good Lightroom performance. But I did reuse the old video card, an ATI 6670 running the 12.8 driver, and it works just fine.
At the moment it's a pretty lean setup: Aside from mobo and video drivers I've only installed Lightroom, CS 5.5 Design Premium and Eizo calibration software. Anti-virus, mouse and keyboard drivers, file synchronization software, font manager and Office remain. I'll keep a close look at how Lightroom behaves as these are added.
Bottom line, and there's no doubt about it: Brilliant as it is, there is sickness in the Lightroom code somewhere. For some people, the unlucky ones, the symptoms are bad. Most people get away with a mild flu, and some are immune.

Lightroom Develop Mode very slow in responding to commands

When I am trying to get a photo ready to print and am in the Develop window, the response time when I try to make adjustments to the phots are not acceptable. Very, very slow and almost impossible to accomplish what I need to do in order to get the photo into the print mode. I have a hang up somewhere but I am at a loss to know how to correct this problem. Any help greatly appreciated

I've got this exact same problem and I've tried a list of things to do. I've been on the internet researching this out for two days and nothing has worked. I have 3 sessions I need to get done and this slowness is unacceptable. LR used to run very smooth and fast and with in the past week its been a dog. It has to be something related in the catalog area. I have 13000 and the catalog is a mess. I don't understand the catalog one bit, I'd rather just have access to folders and upload that way instead of messing with the headache of a dang catalog.........did I say I hate the catalog?
Things I've tried with no results:
optimized catalog
moving RAW cache from external to internal drive
increasing RAW cache from 2G to 20G
preview rendering 1:1 (I really don't understand the purpose of this at all....after waiting for an hours to render 500 photos it did nothing to improve)
Moved a session of photos that I have been trying to work on from my external drive to my desktop (500 photos 10G worth) internal drive
reboot PC
reboot LR3
disabled unused startup programs
my PC is scheduled to defrag once a month
attempt to update Intel graphics driver but there was no new update to download
close all programs and run LR3 by itself
I may have failed to list something but I think thats it. I'm running Win7, Intell Duo Core 2 T6500 2.10Ghz processor, 320HD with about 70% free. I only use my HD to run programs and a external 320HD for image storage and retrieving. This particular drive has about 30% free, maybe less, but like I said before I've disconnected the drive and tried developing from my internal drive with the same results.
I'm out of things to try.........shoot to them over to me and I'll try it. I'm desperate. I'd love to dump the entire catalog and start over. Its so unorganized and I never can find what I'm looking for anyways......I hate that catalog with a passion but I love everything else about LR when its working.

Lightroom 4.4 very slow as of today... Need Help to find out Why???

I've been using Lightroom 4.4 since I've first downloaded and I work on photos on daily basis. Which I worked last night on photos and it worked fine generaly a bit slow as I need to upgrade my desktop computer but it worked fine.
Today I went to use it again and continue from where I left of and it's honestly taking 1-2 minutes untill it loads up the next photo it is insanely crazy... I'm not doing anything diferent, no windows updates... Done full virus scan and it's fine, done the "MSCONFIG" and closed most of the programs on startup and also closed current programs running... so I'm only running what I need.
I don't understand what's happening, very frustrating....
By the way I've got a Nikon D600 which I use the RAW photos of the camera and it's been fine up untill today....

Demon wrote:applications like Stellarium, for example, runs just fine (with vsyncing off it can achieve over 150 FPS), kwin effects run fine, video playback is perfect.
64 bit.
Demon wrote:But, as soon as I start a game like "World of Goo",
32 bit?
Demon wrote:or "Counter Strike" using wine
32 bit!
Demon wrote:Btw. all the logs are not displaying anything unusual.
Try
LIBGL_DEBUG=verbose glxinfo | grep render
That output should be fine.
Try
LIBGL_DEBUG=verbose wine foobar.exe
and pay attention to the first few lines where it loads the driver. It should succeed with some driver from /usr/lib32/...
If this is so, then try
LIBGL_DRIVERS_PATH=/usr/lib32/xorg/modules/dri wine foobar.exe
If it then works, then simply your path is wrong.
All that is assuming that you run 64 bit and have lib32-mesa-full etc. upgraded too.

Lightroom 4.3 VERY slow

I dont think I'm alone with slowness using Lightroom 4. For what it's worth my story is I was using LR 2.6 and worked really well until I recently got a Canon 5D MkIII and needed to upgrade above LR2.x. LR4.3 is VERY sluggish compared to what I had - probably 3-4 times as slow rendering each photo preview when I'm using Develop or Loupe and sluggish making adjustments even basic ones like exposure.
I have tried:
-Optimising the catalog
-Increased the Camera Raw cache to 30GB
-Rendering 1:1 previews at max size
-Purged cache and rebuilt previews
-Set sharpness and grain sliders to 0 (I'll do that last in my processing)
I have even checked it against my Mac Book Pro speed which runs on an SSD and it's slightly better but still not nearly as fast at LR2.6.
I am using a 27" imac with 12GB RAM and 2.8ghz i7. I use this computer solely for editing so I'm not running any other software which means RAM isnt the issue. Processor speed isnt bad so it must be the software right?!
Any ideas?
Would downgrading to LR3.x be any better?
Darryn
http://www.mckayphotography.com.au

I can now report from both sides of the fence. Up until yesterday, I had a four-year old Core2Duo system, 8GB, that had the dreaded slowness. Not as bad as described above perhaps, but there was clearly something not working as it should. Using matrix-based monitor profiles and updating video card drivers relieved some of the symptoms, but the disease was still there.
At the same time I used an i5 16GB system that was much better. Not good (as in instantaneous), but acceptable.
This morning I fired up my new system for the first time and sent it on its maiden voyage. Naturally the first thing I did was open Lightroom 4.3, and...yes. So that's how it's supposed to work! Snappy, immediately responsive, switching images like nothing ever happened.
Phew.
Now this is a pretty high-spec'ed machine, i7-3820, Asus P9X79 pro, 32GB, SSD. Let's not hope these are the real requirements for good Lightroom performance. But I did reuse the old video card, an ATI 6670 running the 12.8 driver, and it works just fine.
At the moment it's a pretty lean setup: Aside from mobo and video drivers I've only installed Lightroom, CS 5.5 Design Premium and Eizo calibration software. Anti-virus, mouse and keyboard drivers, file synchronization software, font manager and Office remain. I'll keep a close look at how Lightroom behaves as these are added.
Bottom line, and there's no doubt about it: Brilliant as it is, there is sickness in the Lightroom code somewhere. For some people, the unlucky ones, the symptoms are bad. Most people get away with a mild flu, and some are immune.

Lightroom mobile slideshow very slow

Lightroom mobile on ipad - takes very long to sync a collection of about 120 jpg. Once this is done, showing them as slideshow takes forever. After two days LRmobile is now only able to show the first four/five jpgs of the collection as slideshow (or in full resolution). It is not my wlan, as at the same time i can transfer the full size jpgs via dropbox in about 45 minutes. If this stays like that, i will continue to use dropbox and not LR.

Update - as this did not work again, i noticed that in LRmobile the collection has the option to activate it for offline editing. Did this - it took 30 min. to download the 14 jpgs!!! Once this was done, they were available at full resolution when opened and also as slideshow. Then deactivating their offline editing did not affect this.
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Any thoughts how to improve?
PS
Uploading the same jpgs to Dropbox and then down to the ipad took about 3 minutes...thinking that I am using dropbox in its free version, but pay for Lightroom...

Apple iMac 5k late 2014 and Lightroom 5.7 very slow

Hello forum,
I bought a brandnew Apple iMac 27" 5k with 32 GB RAM, i7 processor with 4 GHz and the 4 GB graphic engine.
I'm using Lightroom since I have heared that Apple will stop supporting Aperture.
With my older iMac (late 2012) there was no problems with Lightroom.
Now with my brandnew and not cheap iMac I have great performance problems.
The cut- and rotate function (Cmd + R) is horrible slow and ruckelig.
Is somebody here to help me?
In the Adobe suportcenter I havn't found a telephonenumber, only the possibility to write down my problems here.
Thanks for your help!
Regards
Dietrich

I too, have iMac 2014; 4Hz; 32GB; 5K, having up until that point worked on a late '09 2.66GHz iMac - I could have bought a Mac Pro....or anything on offer.
But, this purchase was the result of my going into the Apple Store and having two lengthy discussions/consultations with the Business Team, the sole objective of having them, the experts, specify the best Mac for me and my requirements i.e. to all intents and purposes, operating at 'click speed'.
The team was in full possession of my workflow, the software I used, the file sizes etc. etc......even though it is optimised, I still find my iMac disappointingly slow for the money spent. It boots up quickly enough, and somedays appears to perform better than others, but still I find lags in cropping, loading, using sliders, previews. Other than what I would call slow processing, the most annoying issue is a lag when I use any slider - click on the slider and the image darkens for a second before returning to the setting values. Move the slider and the image darkens slightly, but after a second will return the new value of the new setting. It is impossible to make fine, smooth, real-time adjustments.
BTW, works fine with PS6.
Tried phoning Adobe Customer Support.......no point.
Tried 'Chat'.....no point.
Ended up here in hope

Lightroom 6 Render Very Slow

I have recently upgraded to Lightroom 6 and have found that rendering previews takes about twice as long as Lightroom 5. I have an iMac with 5K Retina display and Lightroom says the GPU is enabled in settings. I'm just wondering if anyone else is having the same issue, because I thought this version of Lightroom was suppose to be faster.

Just checked and it's already off, well disabled due to errors. My problems seem to be more related to the new people module e.g amending the names of tagged faces is taking forever and my whole screen turns black and it takes about 10 secs to complete each amend. May be an idea to just not use this new functionality I guess!

My Lightroom 5 is very slow

It takes ages for images to import, to makes changes with presets, and when clicking from one image to the next it says "loading" for a long time. The images I am currently working on are Jpegs so the files are not big. The computer I am editing on is a new 27" iMac and I only edit off this computer and store all my images on an external, so I don't think the computer would be the problem here...
Any suggestions?
Thanks so much!

FAQ: Experiencing Performance related problems in Lightroom?
Also, try temporarily disconnecting the internet, turn off the firewall and virus checkers

Lightroom is very slow, utilizes 100% CPU, then freezes or closes program. How do I fix it?

I am having a problem with Lightroom 5 being very slow, utilizing 100% CPU, then freezing or closing the program. How do I fix it?
I just upgraded to LR5 from LR3 on Sunday as well as CS6 from CS5 (which I have not tried out yet). I spent several hours talking with Vamil, from LR Support Staff yesterday. He was extremely helpful and kind and tried everything he could think of while remote-handling my PC and talking with me on the phone. He deleted preferences, cache, temp files, updated graphics with a new replacement file from AMD site, then re-downloaded and reinstalled LR5.
It is still very slow and then freezes and closes down with a message of utilizing 100% CPU. Within several seconds of using the brush in Develop, I started having lots of problems. I could not even move the picture around. The side screens would not disappear like they should. And I could not move to another picture. The day before I spent several hours trying to work on just 1 picture. After all the changes yesterday, I tried to move from picture number 1 to about 130 after having not touched it for 10 minutes, and a half hour later, it still said, "Processing" with no picture coming up, just a blank prieview pane.
LR Support suggested I get a new CPU though he thought according to specs mine should be ok and other programs were running fine.
My PC is only 2 years old.
I talked to HP briefly about CPU updates for my HP PC. He said I probably do not have a problem but suggested I run self-diagnostics and maybe buy a new CPU anyway.
I ran diagnostics listed through the HP Support Assistant connection on my PC. All was ok.
I still researched if I could buy a compatible CPU upgrade. I cannot even find any CPUs still selling that are listed for my PC. Best Buy Store said they could not even order a compatible CPU. They said my Bus speed may not be big enough, so they suggest I get a new PC. What Bus speed do I need?
I have the following PC Setup:
     AMD Phenom II X6 1045T Processor 2.70 GHz with 6 Cores
          with 2700 MHz Base, 3200 MHz Boost, and 4000 System Bus Speed, and 95 watts;
     HP Pavilion Elite, HPE-500y, 900 GB Free, new in 2011;
     Windows 7, 64 Bit;
     RAM 16 GB, DDR3;
     Graphics AMD Radeon HD 6450;
     Nikon, D200, with Raw Files;
     External Hard Drive for Original Photos, 600 GB Free;
     LR Catalog and Library are on Main Hard Drive;
     Monitor, Sony CPD-200ES, new in 2004.
I am thinking of buying a new monitor tonight mostly so I can do better photo work while enlarging the pictures to do it. I am concerned that while it will help my viewing, it will take more power away, and make my usage of LR5 even worse. Will a new monitor affect my performance? I am looking at HP Monitors with IPS. Is this the best recommended choice for LR and Photoshop CS6?
I think I would like to stay with a 6 core processor since I need to have several items open for other non-Photoshop functions. When running LR5, I had everything else closed. With LR3, I was able to have other things open.
I do not really want to buy a new computer and know that those I have talked with at this point are only guessing after looking for what they thought should fix it. 4 People from Lightroom Support have all thought I should not be having problems with my setup.
I bought one of the best computers 2 years ago. Is it really obsolete already so that I cannot use LR5? Is everyone else buying a new PC every 2 years? I used to go 5-7 years.
Even though I have figured out some of what my PC has, I really do not know technically what I am talking about so am at the mercy of other's help. Are there any solutions that might work short of buying a new computer?
I also have taken 40th anniversary photos for some people and am waiting to give them as a free gift since I am not a professional at all. I am hoping to get through this problem soon so that I can provide some nice memories for them.
I have not gotten any further than trying to adjust 1 picture. I have no comments on uploading speed, since I did that while still in LR3.
Thank you for your time and help.

I'm running LR with no speed issues on an Intel 17-860 quad core with about the same performance as your AMD Phenom II X6 1045T Processor. My system is also an HP, which originally had a single 1TB 7200 HDD. I've since added a second 2TB Black Caviar HDD, which provided no significant difference in LR's performance.
AMD processors do not implement hyper-threading and don't need it. I'd start debug by process of elimination:
1) Disconnect all externally attached USB, FireWire, or other externally connected devices except keyboard, mouse, and your single 1280 x1024 display. This includes all externally attached memory card readers, phones, ipads, etc.
2) Reboot and logon as Administrator.
3) Remove your Internet connection and turn off all Antivirus and firewall programs.
4) Open LR and under Catalog Settings set 'Standard Preview Size' to 1440 (slightly larger than your display width). Under the Metadata tab here make sure 'Automatically Write changes into XMP is NOT checked.
4) Create a 'New Catalog,' Create a new folder and add about 10 raw image file copies to it for testing, and Import it into the new catalog. In the Import module make sure under File Handling 'Render Previews' has 1:1 selected. Wait until all Preview building has completed in the Library module.
Try editing these image files inside the new catalog as you were previously.

Lightroom 5.5 Import from Catalog *very* slow performance.

Importing from a second catalog from a shoot is *very* slow with the last version or couple of versions of Lightroom. It's been about 20 minutes and the import is moving glacially slow and is only about 20% done.
Here are as many stats as I have:
iMac 27" 3.5Ghz Core i7, 32G of ram, 3T fusion drive (the late 2013 model maxed out)
Master catalog has 117,000 images in it.
The catalog I'm importing has 948 images in it.
CPU use during the import is 100% used by lightroom (note that the multiple CPUs can go to more than 100% so this means I think that one CPU is maxed out, though LR can sometimes take 500% of my CPUs during an export)
Lightroom is using 4.2G of RAM (10G free in activity monitor)
Hard drive is fairly full, but still has 366G free on it (so about 10%)
Lightroom Mobile sync is enabled (not on this folder I don't think) but says "service unavailable" at this point.
Lightroom is fully up to date (5.5) on both iMac and laptop (also a mac in case that matters). Both are up to date with the latest OS software.
How I did it was:
Export the shoot as a new catalog on my iMac
Transfer it to my laptop (smart previews only, no masters)
Edit images, metadata, etc
Transfer the entire folder back (.lrcat, previews, smart previews) to iMac
In my master catalog do an import from catalog
Waited for ages for checking for dupes (which I can understand with such a big catalog)
Selected to import all, changing metadata and develop edits, and selecting to put new images in the folder (not sure why it asked as there weren't any new images)
The last time I did an import I started it and then went out somewhere so I didn't notice how long it took, but this seems completely crazy. In the time it's taken to write this up it's now about 20 minutes later and the progress bar is maybe at the 33% range. It's still working away, it's just crazy crazy slow.
Anything to help out or debug would be greatly appreciated. I suspect it's pure size of the catalog, but 120k isn't outside the realm of what I've heard people say works fine, or maybe the Fusion drive (maybe the OS is trying to move files around behind the scenes)?
Either way this didn't seem to be an issue until the last couple of versions (I haven't gone and re-installed 5.4 or 5.3 to check) and it's starting to really frustrate me

Hi Jim,
Great suggestion! It opens perfectly fine on its own. I even went as far as re-exporting it once it loaded but am still experiencing the same issue. That same catalog loads perfectly fine on my assistant's iMac.
I can't really think about anything that changed in my environment with the exception of a new Bootcamp partition to run windows on an external Thunderbolt HD but I doubt this is related.
I'm open to any suggestions while I am trying this again... 10 minutes of 'Checking for changed and duplicate photos'.

Adobe CC Lightroom en Photoshop installed, only now computer very slow in comparance to Lightroom 5.7, how can i get it faster....? I work on Win 7 Ultimate.

Adobe CC Lightroom en Photoshop installed, only now computer very slow in comparance to Lightroom 5.7, how can i get it faster....? I work on Win 7 Ultimate.

Try to follow below steps
Click on Finder and then hold Command + Shift + G keys on your keypad
It will open Go to folder window, type exactly ~/Library and click on Go
Then open Application Support > Adobe folders
Trash AAMUpdater and OOBE folders.
Now click on finder and hold Command + Shift + G keys on your keypad.
This time type /Library and click on Go.
Make sure to remove ~ symbol.
Then open Application Support > Adobe folders.
Trash AAMUpdater, Adobe Application manager, OOBE folders.
Now Click on Finder and then hold Command + Shift + U keys on your keypad.
It will open utilities folder.
Trash Adobe Creative Cloud and Adobe Application Manager folders
Download and Run CC cleaner tool from below link
http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems/_jcr_conte nt/main-pars/accordion_container_1/accordion-par/accordion-item-1/accordion-item-par/proc e dure/proc_par/step_3/step_par/download/file.res/AdobeCreativeCloudCleanerTool.zip
Accept the license agreement and click on Adobe Application Manager
Then click on clean up selected
Close the window
Download and install Creative Cloud App from below link
Free Creative Cloud | Download Adobe Creative Cloud free trial

Very Slow preview rendering for lightroom 5 on import

I am seeing very very slow rendering of preview images only when using the import function in lightroom 5. By slow, I mean for a shoot of 60 shots in raw, it could take 30 minutes before I can preview them all in the pane to see which ones I want to actually import. This was not an issue with lightroom 4. It is not an issue when using lightroom. Previews are fast there, even for images I've never pulled up before.
My hardware is a PC, with an intell i7 chip, and 16 gig of memory. My nvidia graphics card has the latest drivers.
I've seen a few others reporting this issue, so I'm trying to log it as a bug. Even though the dial up support text on the adobe lightroom says available 24/7, it now plays a voice recording that says only available m-f.
Brad

I'm having the same problem using Windows 7 (64b). I just took a shoot over the weekend for a significant birthday event. Now I can't load the photos. The work-around doesn't work as the program freezes before I get the chance to select the camera under "files".
I recently upgraded from 3.6 to 5 as I was also noticing a slowdown in the import function. That turned out to be a bad move I think. I also deliberately cleaned up the CF card and removed all my video recordings, as this seems to be reported as part of the problem, but to no avail.
This seems to be a pretty major bug to have in a major release that's been around for a while now, that I'm expected to pay for, and no sign of a resolution to date!
Cam.

Recently bought a samsung NX30 camera which came with lightroom 5, after several hours of googling i got it setup properly with the correct camera raw to be able to access my raw images. I found my old laptop was very slow when processing the hundreds of

recently bought a samsung NX30 camera which came with lightroom 5, after several hours of googling i got it setup properly with the correct camera raw to be able to access my raw images. I found my old laptop was very slow when processing the hundreds of images I usually take on a weekly basis. I bought a new faster laptop but when I looked for the cd with the software and serial I could not find it in the Xmas clutter. I downloaded a trial version of lightroom and got it working on my new laptop. Is there a way to access the serial number from my previously installed version and insert it into the trail version to make it work for me?
Myron

Mea culpa
While i registered all my cs2 thru 6 versions and my lightroom 2 thru 4 versions and recorded the serials and saved the adobe registration emails. Since this came as a freebee with the camera i neglected this vital step. I have the instslled version on my old laptop but want to install it on my new one. Thanks to Jim Hess I got the serial so all is well in my world and I will register it with ADOBE
Myron

Lightroom 3.3 speed, very very slow

Does anyone know why Lightroom 3.3 on a Mac is so slow?
The new version 3 was suppose to be faster than version 2. I purchased a new MacPro 12 core with 16GB of ram and with nothing else running, LR 3.3 is still as slow as it was in version 2.
I select multiple images make changes with sync metadata on, and it take minutes before changes show up. My activity monitor shows hardly any activity.
Anyone have any thoughts on why LR3 is still very slow?

rmherzog,
Actually, there are performance issues with multi-core machines (such as yours and mine) that are being researched at Adobe. Hard to pinpoint the problem so I suspect the answer will be a long time coming. Some functions seem to take advantage of all of my cores (like exporting) but other functions (like local editing and spot removal) are hit and miss. LR3 on the same machine is probably always going to be a bit slower than 2.x despite the advertising due to the change in algorithms; however, switching from a quad to a 12-core machine should ultimately over-compensate for that. I have a PC so it isn't limited to Mac machines.
I was able to increase performance quite a bit by turning off hyper-threading (that bios feature that makes the computer think it has twice the number of cores that it really has) and certain software that loaded with the monitor drivers. Now it thinks it has 8 cores instead of 16 and somehow uses those 8 more efficiently than the hypertheaded 16. In any case, depending on how Mac's work you might look into that. There are other suggestions in a similar thread relating to performance posted by Tom from Adobe that you might want to consider as well.
Jeff
PS - strangely enough, the slowest files on my machine are JPEG scans. Local editing can be quite burdonsome for me with these files whereas the RAW files seem to be only mildly sluggish but very consistent.

Lightroom 2.5 very slow

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