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usb hard drive

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    Writing to External Drive with FileVault is slow - Why? How to fix it?

    I have a USB3 5TB hard drive formatted as HFS+ with FileVault (full disk encryption) that I am using with MacOS Mojave. It is about 60% full and is getting slower and slower as I write additional files to it by copying files and folders in Finder. I am getting write speeds of between 80MB and...