FFXIWiki reports the haste cape for gear alone is 25%.
With the latent up, probably means your about to die, wouldn't be a bad idea to swap in this and exchange all your other gear for evasion+, and maybe use a b.haidate for haste cap? :3
Great piece for farming. If where ever you far there is no chance of you dieing.. get your hp down to 25% and go crazy. Also this earring is obviously good if your near death in trouble.