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Not really so. The icon of the duplicated files appears almost instantly but the real file duplication is running in background and takes the time it needs to (get info about the duplicate file and you will see it's size growing in time). This sounds like a cheat because people believe the file is instantly duplicated, while it isn't. Surely there's a reason behind this APFS's feature but I don't understand the real relevance of it.
Question: Hi ! I have an another clarification on mac. When copy files (1.7GB) to external USB drive from my mac, it takes around 6min. I feel it's very slow to my MacBook. I'm using MacBook Air (2017 model) which runs on macOS high sierra 1