M├⌐ven Car has written a pair of interesting blog posts (part 1,
part 2). The
first post is largely about some of the recent new features and performance work
that have gone into the Dolphin file
manager 26.08 release, as well as the KIO framework. The second looks at
the performance improvements and benchmarks for previous, current, and upcoming releases.

Copying many small files is more than twice as fast as it was in April. The gain falls off as files get larger, which is what you would expect: the fix is to the per-file overhead, and once each file carries a megabyte of actual I/O the overhead stops being what you are waiting for.

There is still a gap with cp, discussed at length in the
July post. KIO is doing more than cp does, but not five times more,
and the batching work that closes most of the rest of that gap is still in progress.

https://lwn.net/Articles/1091177/
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