I've been meaning to document this for a while.
If you're finding yourself visiting Special:Export/Import often for the
purpose of MediaWiki development there is a much better way to get content
into your local wiki for testing purposes.
This short video explains how MobileFrontend extension provides tooling to
help you debug live on-wiki content via $wgMFContentProviderClass 
Hope it saves someone lots of time!
Senior Software Engineer