Ezio Melotti
Seriously, minidom is widely known for being extremely slow and extremely memory hungry. And that is backed by basically any benchmark that has ever been done on the subject.
Do you have any link?
My point is that if you say thing like "significantly/several times higher memory footprint than X" you are basically scaring the users away from the module. If for an average documents it takes, say, 30-50MB of memory, it seems perfectly reasonable to me, even if ElementTree takes 3-5MB. I would actually consider 100-200MB still ok too, unless I have to parse lot of documents or I'm running low of memory for other reasons.
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