Are you using Lightroom in 64-bit?

[singlepic id=71 w=320 h=240 float=left]I was surprised to find out that I had been running Lightroom in 32-bit mode and so even though I have a fancy computer with tons of ram and multiple cores, Lightroom was puttering along just like it did on my old 2GB core duo machine, YIKES. How did I know? It seems that Lightroom will actually tell you on the opening credits screen if it is running in 64-bit mode. When you open Lightroom the credits screen shows for a few seconds or you can bring it up manually by clicking, Lightroom>About Lightroom. The screen shot at the right (click any picture to enlarge) shows Lightroom in 64-bit. If yours does not say 64 you are not utilizing your machines capabilities.[singlepic id=70 w=320 h=240 float=right]

Lightroom on the MAC installs both 32-bit and 64-bit versions and by default activates the 32-bit version. Which is fine. (Under Windows you have to select which version to install, so you guys don’t need to read anymore.)

When I opened the More Info panel for Lightroom it showed that indeed that “Open in 32 bit mode” was not checked. However, the credits screen did not show that Lightroom was running in 64-bit mode! I am sure that you know how to get to the info screen via Finder>Applications>Adobe Lightroom. Here is another screen shot to help.

[singlepic id=69 w=320 h=240 float=left]

My solution was to select “Open in 32 Bit Mode” and then open and close Lightroom. Go back and then de-select the 32-bit mode and voila, when Lightroom opened, I’ve got 64-bit!

I have to say it is a gigantic difference, duh! Going from 3GB of RAM to 10 is going to make a difference. I just got the MAC and so when something isn’t right, I assume user error. After my discovery I was very excited and so I called several friends. To my shock it wasn’t me, they were not in 64-bit either and they knew what they were doing. I bet a lot of you are not in 64-bit mode either.

After the switch, Lightroom is now turbo-charged and changes made to images in the develop module are instantaneous. This is what I was expecting with the new MAC…WOW! So check your settings to make sure that you are also in WOW mode!


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  1. carol a dwyer

    jeff, thanks for your help. i know you are very busy. i want to know if i am IN 64 bit. There are no longer any photo screen shots with your article for me to click on. My program opens so fast I cannot read any credits. There is NO area called “Lightroom/About Lightroom.” Under HELP we have “About Lightroom” (opens to a contract.) HELP/system info shows my software architecture is 64x but that doesn’t mean my computer is using it. You don’t say where the Finder/Info Screen is. . .in computer, or inside Lightroom. My computer search does not have a Finder/Applications/Adobe Lightroom. I go to my list of programs and click the icon — it just opens the program. Right click – no help. Under C/program files/Adobe/Lightroom/ properties. . . I find nothing of use in all the tabs. I will now research where to find “open in 32 bit mode”. I have a dell alienware I5 intel 7500, 4 core, 6 mb cache, turbo, 256 SS C drive and extra 1 TB ss samsung B drive. thanks for enlightenment. your images are fab.

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