A:Answer Input Lag is not an official TV specification so it will not be listed in the specifications for the LG 50 inch Class 4K Smart UHD TV (49.5'' Diag), Model # 50UM6900PUA. There are a few different Input Lag Test methods that are used to test for Input Lag and they will give different results. You can find online reviewers who test the TVs they review and post their results on their sites. Some of the reviewers list the Input lag for this TV at 10.7 ms for 1080p @ 60 Hz, 10.3 ms for 4k @ 60 Hz, 12.6 ms for 4k @ 60 Hz + 10 bit HDR, 9.1 ms for 4k @ 60 Hz @ 4:4:4. The TV supports Automatic Low Latency Mode (ALLM) so it will automatically enable game mode for most gaming devices...^IFV