Technically, you could do the XML side of things without XML::Generator::DBI, and it would be faster since you could code if for your specific case rather than making a general DBI-->XML tool. Then you could take full advantage of all DBI speed tweaks. However, you would probably end up writing a lot more code.
When comparing performance, I do think that being unable to fully use DBI's performance features matters. Personally though, I would be more interested in knowing how easy it is to code the different approaches, since they all seem to perform well enough.
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