I've been asked to post about the increased mantle speed in 2.12 as some folks have been curious about the change. After a lengthy internal discussion along with testing and input by several mission authors, it was agreed internally to increase the mantle speed. But during 2.12 beta testing, we would like feedback on any bugs or issues that you find. The reason for the change was to address feedback from players that mantling was "painfully slow", "slow and clunky", "mantling sucks - i