Calendar

[Kid_who_uses_debian]

They say that btrfs is slow. Is that correct?

[Mad Penguin]

The question doesn't warrant a yes or no answer - it depends on the context and how you use it.
See here; https://www.linux-magazine.com/Online/Features/Filesystems-Benchmarked (https://www.linux-magazine.com/Online/Features/Filesystems-Benchmarked)
More specifically, BTRFS does more work / has more features than many other filesystems, hence you would expect it to be slow(er) under some workloads.