Macbook Pro (Sequoia 15.3.1) Slow with Extrernal SSDs

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Mommacat said:
Fyi, this morning I had to do the same thing. Use @JP Onstwedder suggestion to force the "Open With" from Finder first. Then DxO would recognize the .ARW files from LRC and DxO directly. And even after another reboot, 38 files took ~8 minutes to process on my Macbook Pro M3 Max with 36 GB of memory and plenty of interal HD space running Sequoia 15.3.1. Have to say my ancient HP running Win 10 performs better than this now. I guess I'll try another uninstall/re-install of DxO, but not sure I want to rename the LR Catalog just yet. Still waiting to hear back from DxO.
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This is the DXO database I was suggesting not the LR catalog. To me this seems like a DXO issue. You aren't saying LR is running slow otherwise.
 
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DxO doesn’t use a database the way LR or C1 do. It stores the metadata and processing data in sidecar files which are saved side by side with the raw files. Processing speed is a function of CPU/GPU speed which clearly is the same whether the files are on an internal drive or an external one; RAM (same), and file read and write speed. DxO reads the raw files and any existing sidecar files and writes only the small sidecar files which usually are a few kb. It’s hard to see how reading and writing small sidecar files can be so different between two drives, especially if there is no overhead from database indexing or integrity checking (and DxO doesn’t have either). Do you run any other software that indexes the drive like Spotlight or other search tools? Security software could also impose a speed penalty, as could encryption software. Maybe try booting the Mac into safe mode (look up on Apple’s website how to do that—it depends on the model and the OS version) and see if the performance gap persists.
 
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