[gbletr42]

I've updated the benchmarks to include those flags. I've also specified the versions of all software involved.

It seems par2 is significantly faster with those options set than without, as in by an order of magnitude, it seems par2 struggles greatly with the large number of blocks that it sets by default. Thank you for telling me.

[Nyan]

Nice work - thanks for your efforts!

Yeah, the compute complexity for Reed Solomon is generally O(size_of_input * number_of_recovery_blocks)

If you don't specify the number of blocks, par2cmdline defaults to 2000, so at 25%, it's generating 500 parity blocks, which is obviously much slower than what you're generating with the other tools.

Having said that, PAR2 is generally aimed at use cases with hundreds/thousands of parity blocks, so it's going to be at a disadvantage if you're generating less than 10 - which your benchmark shows.