There are some issues about splice e.g. [FUSE breakage](https://github.com/uutils/coreutils/issues/9609) and [performance drop with small input](https://github.com/uutils/coreutils/issues/10832). It might be worth to try sendfile, copy_file_range 1st (though internal splice usage of them might still break FUSE).
There are some issues about splice e.g.
FUSE breakage and performance drop with small input.
It might be worth to try sendfile, copy_file_range 1st (though internal splice usage of them might still break FUSE).