Input delay refers to a phenomenon in which an individual takes longer than usual to process and respond to new information or stimuli. Full definition
Overall 1 vs. 1 worked well but when you run into someone with a bad connection matches are filled with input delay and move in slow motion. (nintendotoday.com)
The easiest way to deal with it is to add input delay. (gameondaily.com)
The standard, bad way of doing online play in fighting games is to use input delay. (fantasystrike.com)