The short answer to the question is no. A lag in data transfer is caused when data has to be processed. Usually, such lags are not noticeable to the human eye. However, heavy tasks such as converting analog data to digital data may cause some slowness to your input chain. The main purpose of the HDMI Switch is to help you shift between your multiple HDMI devices. The HDMI Switch does not process any data. As a result, HDMI switches will not cause any noticeable lag in your workflow. Most HDMI Switches have data transfer speeds that range between 3.2Gbps to 18Gbps. So even if your switch has a speed of 3.2Gbps, the speed is high enough for you not to notice any lag!