Board Thread:General Coding Help/@comment-24473195-20150113124005/@comment-11733175-20150115140829

Getting a list of category members with lua isn't actually possible, it requires the ability to query the MediaWiki API which isn't available with lua. The methods posted above actually use parser functions which are then passed to lua. As whatever lua implementation you're using is going to be waiting on the PHP parser function call to complete before reformatting, it's likely js would actually be faster.