> Should we forget to care about performance, just because different > setups might yield different results? No, we are not forgetting about performance. You asked for a benchmark, I presented one. I fail to see your problem. I claim that the performance of namespace packages is just fine, and presented a benchmark. PJE claims that the performance of namespace packages is fine, and provided reasoning. If you want to see two specific scenarios compared, provide *at least* a description of what these scenarios are. Better, just do the benchmark then yourself. In general, I think there is a widespread misunderstanding how new features impact performance. There are really several cases to be considered: 1.what is the impact of feature on existing applications which don't use it. This is difficult to measure since you first need to construct an implementation which doesn't have the feature, but is otherwise identical. This is often easy to reason about, though. 2,what is the performance of the feature when it is used. This is easy to measure, but difficult to evaluate. If you measure it, and you get some result - is that good, good enough, or bad? For 1, it may be tempting to compare the new implementation with the previous release. However, in the specific case, this is misleading, since the entire import machinery was replaced. So you really need to compare with a version of importlib that doesn't have namespace packages. Regards, Martin
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