I'll just add that I tried it and pzstd -12 is still significantly slower than lbzip2 -9 on my machine, with approximately the same compression ratio for linux-

I'll just add that I tried it and pzstd -12 is still significantly slower than lbzip2 -9 on my machine, with approximately the same compression ratio for linux-5.0.8.tar. EDIT: no surprise, as -T0 also enables multithreading.