Thread:Extension talk:DynamicPageList (Wikimedia)/Performance concerns regarding the Intersection extension

I see in this bug comment and others that there are performance concerns regarding Extension:Intersection; Tim Starling said a year ago, "We don't want to enable it on any wikis which have a lot of pages, since there is a risk of DB overload due to extremely long-running queries." Is this still the case, or would it be have the performance concerns been addressed?

Also, it's a bit difficult for me to find more thorough discussion of these performance issues, and a link would be appreciated. Thanks.