Write Disk A lot

Hi ​@lrc_user_467490456,

Thanks for sharing such detailed findings. The behavior you’re describing (heavy writes to cr_sdk_*.tmp in temp folders) is not expected at that scale, so let’s capture this properly.

Could you please try:

• Update to Lightroom Classic 15.3
• Update macOS to Tahoe 26.4.1 (if not already)

Please check whether the issue still occurs.

To help us investigate further, please share:

• A short screen recording showing the disk write spike (Activity Monitor or similar)
• Copy & paste your System Info from: Lightroom > Help > System Info
• Does this happen only while editing (Develop module) or even when Lightroom is idle?
• Does it start after a specific action (e.g., opening images, zooming, masking)?
• Whether this is reproducible consistently

There has been one report of high disk activity in a different context, but those were tied to background apps (like Spotify) or Windows-specific I/O patterns. Your case appears different, so we want to keep this scoped correctly.
 

Once we have the above, I’ll take this to the product team with your findings.

Regards,
Anshul Saini

Observing that this file is almost immediately deleted after writing, as it cannot be seen at any time. And this/private/var/folders/g8/47gdc5wn4yx370flbr2cms5m0000gn/T/directory takes up very little space on my macOS, almost zero. Just create a 512MB ramdisk and mount it to this directory, then restart LRC to solve the disk write problem.

This bug may cause the hard drive to consume too quickly, resulting in over 300GB of writes per hour for my usage.