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| p.1 #3 · Lightroom vs camera raw |
I've never tested the two against each other, but I'd also wonder if something else isn't happening at the same time - an extra 3 minutes for effectively the same piece of software to do it's job would be unexpected.
Do you know how to check how many processes are working at once? It's in the top left corner - you should see a single process if just one thing is happening but it could be more if it's doing something else too.