1. A method for limiting processing resources incurred due to refreshing a user interface of a first terminal, the method comprising: at a first terminal, receiving a plurality of event indications which indicate respective events, each of the event indications being received at a different time; and based on the event indications, refreshing the user interface of the first terminal to reflect each of the respective events; wherein said refreshing comprises determining a plurality of time periods, and during each of said time periods postponing the user interface from being refreshed to reflect any outstanding ones of said event indications until that time period has elapsed; and wherein said time periods are each determined having a length set in dependence on a timing of the receipt of one or more of said event indications, the length of a later of said time periods being set to an increased value relative to an earlier of said time periods in response to the receipt of one or more of said event indications within a time limit.