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I seem to remember that there were cases when enabling FileVault was degrading performance. That was many years ago and I can't find anything here or elsewhere suggesting that there could be issues.
Can we assume that FileVault doesn't cause LR problems?
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HI, I just tested turning on FIleVault on my Mac. using Catalina OS and did not notice anything degraded.
I normally do not use File Vault, so I am not sure if this is a one time problem or if whatever it was has been resolved.
You can try testing it on and off and see if you see a difference in performance.
It might also depend on operating system and computer model?
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You should always have this turned on and no it does not cause any performance degradation and hasn't for a very long time.
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Thanks both for the input – much appreciated 🙂