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TBB was already far from the state-of-the-art 7/8 years ago, and there are continuously new approaches that outperform it such as https://github.com/taskflow/taskflow ; https://github.com/google/marl ; and the most recent contender https://github.com/dpuyda/scheduling

I know TBB will still be supported 5 years from now, though.

TBB is a required dependency on some systems if you use ‘std::execution::parallel_policy’ functions

You can see in the repository that it was benchmarked against oneTBB.