thrown speed is pro for getting a little ranged spin throwing and keep going its a type of rogue kiting, and also for breaking bandages fast for example if you already blew your trinket and you get cced be ready to throw fast so you clip the bandage of at 1-2 ticks instead of full heal.
Edit someone already answered but yeah maybe i added a little more detail, and especially at lvl 10 you HAVE to keep your opponent in combat, not just warrs who charge but everyone. my hunter is a troll and with troll regen and the regen you get from haste, i am full health in 3-4 seconds of getting out of combat, its like a bandage almost, you have to do fast throw to keep regen down or you will lose the progress of any damage you have accomplished.