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Any word about performance?

I'm using `std::function` and `std::vector` in the implementation, which allocates.

I haven't written any benchmark, but I assume this would be the bottleneck. I made this tool for a small CLI utility not concerned about performance.

I'd be happy to receive recommendations (and even PRs) though.

For us it clearly were dynamic memory, formatting and console output that killed (realtime) performance.