User blog comment:Grunny/Introducing Lua, for faster and more powerful templates/@comment-1370845-20140618124517/@comment--20140618144636

Right now, SMW does not integrate a lot of Lua support - https://semantic-mediawiki.org/wiki/Help:Writing_Lua_modules. Honestly, what makes SMW expensive (querying a database) can not really be replicated by Lua. Certainly some of the expensive rendering of queries could be fixed with Lua (when you use, having that template invoke a Lua module), but the heart of the matter is SMW is for heavy data storage and Lua is for lightweight coding.