Lightroom 1.3 creates CameraRaw Cache

I import raw files to an external hard drive on a Win XP system. After installing 1.3, I have a new folder C:\Documents and Settings\my name\Local Settings\Application Data\Adobe\CameraRaw\Cache. A Cache ###.dat file about the same size as the original raw file is created when I open the picture. I use PSE 4.0 to edit so I do not see a need for the CameraRaw file. How can I turn this off? It was not part of v1.2.
Thanks, Richard

Hi Thomas, I measure the timings with the Process Monitor under vista. It shows all IO done by a program. I have a quad core 3.7 ghz machine, with brand new 750GB hd's in raid1 mode, that do about 75MB/s continuous writing. The catalog and images are on a seperate 2TB raid0 volume that does 115MB/s continuous writing.
I just started a preview generation. I use 2048, high quality (because im on the road a lot, and would like somewhat ok images with me).
Here is the first mention in the log of this image, COR_20071003_25547.NEF:
i 1784404 10:53:14.1068606 PM lightroom.exe 4644 QueryDirectory E:\Images\Originals\Cor\Underwater\Solomons\Solomons September 2007\20071003\COR_20071003_25547.NEF SUCCESS Filter: COR_20071003_25547.NEF, 1: COR_20071003_25547.NEF
It reads the 20MB raw file, which takes 0.3 seconds
1785808 10:53:14.4110567 PM lightroom.exe 4644 ReadFile E:\Images\Originals\Cor\Underwater\Solomons\Solomons September 2007\20071003\COR_20071003_25547.NEF SUCCESS Offset: 19,750,912, Length: 1,816, Priority: Normal
Next it fires off a few threads, which take about 0.05 seconds to finish. No idea what these threads do, they seem to take almost no processor time.
Now it starts reading the CameraRaw Cache index file:
1785890 10:53:14.4728629 PM lightroom.exe 4644 QueryOpen C:\Users\cor\AppData\Local\Adobe\CameraRaw\Cache\Index.dat
It starts another set of threads, which also take 0.05 seconds to finish.
Now it has figured out the cache file doesnt exist, and it starts writing it, we're only a mere 0.4 seconds into the process:
1785935 10:53:14.5149033 PM lightroom.exe 4644 CreateFile C:\Users\cor\AppData\Local\Adobe\CameraRaw\Cache\Cache0000013254.dat SUCCESS Desired Access: Generic Read/Write, Disposition: OpenIf, Options: Synchronous IO Non-Alert, Non-Directory File, Random Access, Attributes: N, ShareMode: None, AllocationSize: 0, OpenResult: Created
The cache file is 17MB, and finishes 4.5 seconds later.
1795111 10:53:18.9960440 PM lightroom.exe 4644 CloseFile C:\Users\cor\AppData\Local\Adobe\CameraRaw\Cache\Cache0000013254.dat SUCCESS
Somewhere in the middle of this the actual preview is being written, I guess these things happen in seperate threads:
1793108 10:53:17.6010975 PM lightroom.exe 4644 CreateFile E:\Images\Catalogs\Lightroom_Cor\lightroom_cor\lightroom_cor Previews.lrdata\8\8921\89210BFF-9147-4A7E-819F-CAABEEB30CC7-8e5855ce63af82e5b518514a2227b a68-97.lr-preview.noindex SUCCESS Desired Access: Generic Write, Read Attributes, Disposition: OverwriteIf, Options: Synchronous IO Non-Alert, Non-Directory File, Attributes: N, ShareMode: Read, Write, AllocationSize: 0, OpenResult: Created
1793170 10:53:17.6234413 PM lightroom.exe 4644 QueryOpen E:\Images\Catalogs\Lightroom_Cor\lightroom_cor\lightroom_cor Previews.lrdata\8\8921\89210BFF-9147-4A7E-819F-CAABEEB30CC7-8e5855ce63af82e5b518514a2227b a68-97.lr-preview.noindex SUCCESS CreationTime: 11/23/2007 10:53:17 PM, LastAccessTime: 11/23/2007 10:53:17 PM, LastWriteTime: 11/23/2007 10:53:17 PM, ChangeTime: 11/23/2007 10:53:17 PM, AllocationSize: 1,155,072, EndOfFile: 1,153,664, FileAttributes: A
This takes a whopping 0.02 seconds.
And we're on to the next image:
1795837 10:53:19.2355255 PM lightroom.exe 4644 QueryDirectory E:\Images\Originals\Cor\Underwater\Solomons\Solomons September 2007\20071003\COR_20071003_25548.NEF SUCCESS Filter: COR_20071003_25548.NEF, 1: COR_20071003_25548.NEF
So, let me put the timings close together:
10:53:14.1068606 image read
10:53:14.4110567 done reading
10:53:14.4728629 read camera raw index
10:53:14.5149033 start writing camera raw cache file
10:53:18.9960440 end writing camera raw cache file
10:53:19.2355255 next image
I dont know what LR does internally, so this could be giving a totally wrong idea of whats happening. If the writing of the image is done as a stream while LR is calculating the final image, and not merely writing an internal buffer, then a huge part of that 4.5 seconds would also be used if it werent writing it. Only the LR devs can shed light on that. All I know is, if it isnt writing that cache, for instance when that cache file already exists, then it takes at most a second. Which would be about right looking at the above timings.
Regards,
Cor

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