Some huge pages edited by bots are using a disproportionate amount of resources in Parsoid and RESTBase. Examples for this are http://it.wikipedia.org/wiki/Utente:Biobot/log, or
https://ur.wikipedia.org/wiki/%D9%86%D8%A7%D9%85_%D9%85%D9%82%D8%A7%D9%85%D8%A7%D8%AA_%DA%A9%DB%92. Both are huge pages that are edited very frequently by bots. They are both very unlikely to be edited in VE.
In Parsoid, such huge pages (>2mb wikitext) cause high load and timeouts.
In RESTBase, those pages created wide rows T94121, and use a lot of storage space. For example, http://it.wikipedia.org/wiki/Utente:Biobot/log uses roughly 30G of storage per month alone. T94121 discusses options for handling such cases more efficiently, but this will take some time to implement.
To reduce the unnecessary resource consumption in the meantime, I propose to add an update blacklist in RESTBase, blocking automatic re-renders for these pages from the job queue. A dozen or two of pages on this list would save a lot of resources in Parsoid and RESTBase until magic solutions for dealing with this abuse have arrived.
See also: