LCD Monitors and Processing Delay for Arcade Gaming

Current "gamer LCD monitors" have an input delay caused by the overdrive of about 2 frames (30ms), older LCDs have a more blurry picture, but no input lag (Since 2011, you can find monitors with 1 frame or less of delay (15ms)). LCD and Plasma TVs have a common delay caused by the deinterlacing, scaling and processing of the input signal of about 30-50ms. Some TVs come up with 100ms delay (Samsung A6 series with 100/120Hz), some TVs have a gaming mode which reduces the lag to 10-20ms. If your deinterlacing device adds a delay of it's own now (e.g. 50ms) to an already slow LCD television, things get pretty unplayable. You won't be able to hit your arrows in Dance Dance Revolution, you won't be able to perform your combo moves in Street Fighter and you won't be able to dodge bullets anymore in DoDonPachi. As a player you'll be able to adapt to a certain delay, but you should nevertheless try to keep the delay as low as possible.