Multi-threaded compression/encryption

dar isn't multi-threaded by itself, as the documentation explains. This
is reasonable. However, why dar's compression is not? Even certain
encryption algos are multi-threaded in openssl (IIRC AES in CBC mode).

Parallel compression (of the same file/data stream, not different dar
processes/trees) is particularly one feature I am missing from dar.

Example: many *nix system come with gz/xz by default. There are also
less used pigz/pixz variants. On a typical server or desktop/high-end
laptop with 8 cores (4+HT), gz/xz never use more than 12.5% of total
system's power. pigz/pixz use 100%, i.e. all cores. This makes drastic
difference in compression speed.

Is there any reason why dar isn't compiled against such gz/xz variants?

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