When watching movies or video, you might notice that the sound arrives before the picture does, so people's lips don't match their words, or you hear gun shots in action movies before the character on screen has actually fired. When lag is particularly bad, you will likely notice that something is wrong. In other words, there are a lot of things that can slow down an image in transit.

Automatic irises adjust themselves based on the average illumination in a scene, which (you guessed it) adds processing time. If you're using advanced features like frame interpolation or smart sharpening, those frames of video must be analyzed in sequence and altered before reaching the screen, which adds processing time. When that image isn't in the projector's native resolution, it has to be scaled, and that can add processing time. That's just the nature of digital video processing - the projector has to take a stream of ones and zeroes and reconstitute it as an image.

All digital projectors, regardless of their specifications or intended use, will incur some amount of input lag. This is the time difference between when a video signal arrives at your projector and when that picture is displayed on the screen. However, we're primarily concerned with input lag. The term 'lag' can refer to any time difference. While lag cannot be eliminated, reducing it is key to a great gaming experience. This difference - the time between when an event occurs and when you see it occur - is called lag.

The difference between 'now' and 'a fraction of a second from now' can be the difference between victory and defeat. When playing certain video games, it isn't just every second that counts - it's every millisecond.

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