LR3 64 bit noticeably slower than 32 bit

I just upgraded my PC from XP Pro 32 bit to Win 7 64 bit. It has a Q6600 CPU and 4 gb ram. With the upgrade I now have LR 3 64 bit as well. I'm surprised at how slow everything is now compared to what it used to be. I'm processing 30D raw files so they aren't very big. Before when I would choose a photo in the Library and go to Develop it would be almost instantaneous, now it takes about 7 seconds before the photo appears in the develop window. Before I could apply any develop tool and see immediate change, now many of the tools take several seconds to react. Has anyone else seen this or does anyone know why?

Kent Clark wrote in post #14370321
I just upgraded my PC from XP Pro 32 bit to Win 7 64 bit. It has a Q6600 CPU and 4 gb ram. With the upgrade I now have LR 3 64 bit as well. I'm surprised at how slow everything is now compared to what it used to be. I'm processing 30D raw files so they aren't very big. Before when I would choose a photo in the Library and go to Develop it would be almost instantaneous, now it takes about 7 seconds before the photo appears in the develop window. Before I could apply any develop tool and see immediate change, now many of the tools take several seconds to react. Has anyone else seen this or does anyone know why?

lr3.6? if you havnt updated to 3.6, some of the past versions had performance issues such as with adjustment brushes. plus you might consider more ram as win 7 is more ram intensive.

Hmm, I don't know, I'd say post that in the LR Forum, except LR4 is out now! Maybe still if you put in a Bug Report someone may look into 64-bit issues...?

A lot of people are reporting slow-down issues with the new LR4, but of course that may or may not be related, and if they do get a fix out for LR4, it won't help you (unless you upgrade)!

I actually have LR 3.6, I just said LR 3 to distinguish it from LR 4.

Kent Clark wrote in post #14370321
I just upgraded my PC from XP Pro 32 bit to Win 7 64 bit. It has a Q6600 CPU and 4 gb ram. With the upgrade I now have LR 3 64 bit as well. I'm surprised at how slow everything is now compared to what it used to be. I'm processing 30D raw files so they aren't very big. Before when I would choose a photo in the Library and go to Develop it would be almost instantaneous, now it takes about 7 seconds before the photo appears in the develop window. Before I could apply any develop tool and see immediate change, now many of the tools take several seconds to react. Has anyone else seen this or does anyone know why?

You may want to upgrade to more RAM.

The really strange thing is that I had a 32 bit XP Pro Dell workstation at work, running on a Xeon 3503 cpu with 4 gb ram. LR 3 would not run on it, it took several seconds to scroll, several seconds to do anything, it was unusable. I posted about it here and on several other forums but I could never get it to work. We just upgraded to Win 7 64 bit, I installed LR3 64 bit and it works without a hitch, everything is smooth and responsive, just like my home pc used to be before the upgrade, so 4gb of ram appears to be enough for that pc.

I may buy some more ram, it's cheap.

Hen3Ry wrote in post #14372514
You may want to upgrade to more RAM.

I agree; 4GB just isn't enough. 64-bit Windows uses more memory than does 32-bit Windows, and 64-bit Lightroom uses more memory than does 32-bit Lightroom.

So my guess is that your 64-bit Lightroom on 64-bit Windows is starved for RAM, and once you add some more RAM, the problem will go away.

Good thing RAM is unbelievably cheap these days. Here is 8GB (2 4GB sticks) for $38:

http://www.newegg.com …aspx?Item=N82E1​6820231424

Don't go buying RAM without first checking what your motherboard can handle. If you tell me what computer and motherboard you have, I can help.

Adding memory does not necessarily make things run faster. It will only help if you are memory bound. If you have 4 gig of memory and are only using 3, adding an additional memory will not speed things up.

To check to see if you have a memory issue, open the task manager, click the performance tab and see how much you are using. if you are getting really close to your 4 gig, then it helps to add memory. If your less than say 3gig then adding more will do nothing.

I just took a look at my usage. I have a file manager open, Firefox, Chrome, skype, DPP, Photoshop4, LightRoom4, and Word and am only using 2.77 gig. If I open say 5 images in PS and create a few layers I can drive it over 3gig.

gjl711, which operating system are you using? 32-bit or 64-bit version?

Win7-64

OK.

I don't believe that 4G is enough memory for 64-bit Windows. I believe 8GB is the minimum for a photographer, and given the low cost ($38!), I don't think it's much of a discussion.

Also, it's not so simple to determine how much memory your computer is "using"; you have to take into account the swap/page file, which shows up as "Commit (GB)" on the Performance tab.

But I think that Mr. Clark's experience is clear; same hardware, but upgraded from 32-bits to 64-bits, and it's slower. That tells me that is the RAM.

InterMurph wrote in post #14372904
OK.

I don't believe that 4G is enough memory for 64-bit Windows. I believe 8GB is the minimum for a photographer, and given the low cost ($38!), I don't think it's much of a discussion.

Also, it's not so simple to determine how much memory your computer is "using"; you have to take into account the swap/page file, which shows up as "Commit (GB)" on the Performance tab.

But I think that Mr. Clark's experience is clear; same hardware, but upgraded from 32-bits to 64-bits, and it's slower. That tells me that is the RAM.

It's not enough. Your machine is probably thrashing. This is a highly technical term which means it's spending more cycles on managing your OS than it is your workload. Two I/Os for paging, one for you.

The conclusion you guys made (Mr Clark's pc is slower after upgrade because Win7-64+Lr3-64 need more RAM than WinXP+Lr3-32) still does NOT make sense. The Lr3 on Mr Clark's Dell machine at work runs FASTER after they went from WinXP-32 to Win7-64. The Dell has 4Gb RAM as well.

cfcRebel wrote in post #14373996
The conclusion you guys made (Mr Clark's pc is slower after upgrade because Win7-64+Lr3-64 need more RAM than WinXP+Lr3-32) still does NOT make sense. The Lr3 on Mr Clark's Dell machine at work runs FASTER after they went from WinXP-32 to Win7-64. The Dell has 4Gb RAM as well.

Really? The poster above went from 3GB to 4GB on a 32 bit system and had a noticeable performance increase. That doesn't make sense either, huh?

And it's not a conclusion, it's a suggestion based on experience.

there could be other factors that can slow down lr3 for kentclark. one possibility is that previews are still rendering if the catalog is big. Another possibility is that the catalog size at his workstation might be small or empty vs his home catalog. also, the HDD could also be a factor. one hdd could be slow. But any ways, it shouldnt take 7 seconds to go from library to to develop module. even c2d processors can switch faster.

also older images that are no longer cached take longer to load.