Please could you let me know how is 'Wait for Item update" internally implemented by Nintex. Does it use Timer job to regularly poll to see if the condition is met? or does it use like a trigger which will only fire if that particular column is updated. May be handled via DB triggers etc?
The reason is performance related and I have a scenario when the parent workflow needs to be notified by a child workflow for a particular trigger (update status for the item on the parent list) and don't want it to poll continuously to check for a status change? Are there any other alternatives?