Effects of Display Lag On Users
Display lag contributes to the overall latency in the interface chain of the user's inputs (mouse, keyboard, etc.) to the graphics card to the monitor. Depending on the monitor, display lag times between 10-68 ms have been measured. However, the effects of the delay on the user depend on each user's own sensitivity to it.
Display lag is most noticeable in games (especially older video-game consoles), with different games affecting the perception of delay. For instance, in World of Warcraft's PvE, a slight input delay is not as critical compared to PvP, or to other games favoring quick reflexes like Counter-Strike. Rhythm-based games, such as Guitar Hero, also require exact timing; display lag will create a noticeable offset between the music and the on-screen prompts. Notably, many games of this type include an option that attempts to calibrate for display lag. Arguably, fighting games, such as Street Fighter and Tekken, are the most-affected, since they may require move inputs within extremely tight event windows that sometimes only last 1-3 frames on screen.
If the game's controller produces additional feedback (rumble, the Wii Remote's speaker, etc.), then the display lag will cause this feedback to not accurately match up with the visuals on-screen, possibly causing extra disorientation (e.g. feeling the controller rumble a split second before a crash into a wall).
TV viewers can be affected as well. If a home theater receiver with external speakers is used, then the display lag causes the audio to be heard earlier than the picture is seen. "Early" audio is more jarring than "late" audio. Many home-theater receivers have a manual audio-delay adjustment which can be set to compensate for display latency.
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