I suggest that you add this Plugin https://www.spigotmc.org/resources/titlemanager.1049/ QuickBoard is rlly buggy and doesn't work on 1.8 and ScoreBoard Revision is very buggy!
TitleManager has a ScoreBoard that doesn't cause lag at all and a tablist that doesn't have any bugs! I really want to start using this please add it as soon as possible!
Thank you!