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If you uninstall any of the generators they will not generate. There is not a way to specifically turn of generators for a specific package, because although you know that you don't need the generators for that package. The point of messages is that they can be reused by downstream packages. As well as being able to use tools in python or c++ (For example rostopic echo is a python tool, thus to use standard debugging tools you need the python generated code)

There's a larger problem of your machine running very slowly. On a typical system I would expect what you're talking about to take wholly well under a second. This suggests very slow disk access.