SoftTalker parent
Well POSIX only defines behavior, not performance. Every platform and OS will have its own performance idiosyncracies.
How on earth would POSIX define performance of something like pipes?
I was addressing "it's all posix and given it's all in memory the performance will be more or less the same."
Not claiming that POSIX should or could attempt to address performance.
By using Big O notation, or deadlines like on RTOS APIs, as two possible examples on how to express performance on a standard.