What features are important for a gaming monitor? For fast-action games, it is primarily the response time. Nothing is worse for a gamer than image ghosting occurring at the wrong time resulting in the action being subjected to blurring or flicker. This could be the difference between victory and defeat! Another important decision is the monitor size. 24 inches is usually sufficient but if you are sitting further away, 27 inches is preferable, ideally with a 4K resolution.