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It is quite possible to know that the mesh is not exactly as documented without having realized that the difference has a severe performance impact.

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I think they also addressed the performance issue in addition to saying it is not documented: "...evolving away from the global backlog concept in order to provide better support for different concurrency models"

The fact that a year later, performance for their starting use case had not been addressed says that they failed to address the performance issue.

It is still not clear to me that they actually really understood the performance issue, or how big it was going to be.

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