First it tryed the stone guardians instant spawns about 20 hours but found 1 shard only and also its fixed so i searched something new and more efficient way to farm that shit..
well THIS spot is just godly. Stonebark Trickster - NPC - World of Warcraft
it took me around 15 hours to collect 9 shards, 2 world epics, around 600 motes ( converted into 300k+ gold) !
they are low life with 230k~ hp and you can make a good route if you start on the top of the hill ( where the 2 camps with 5-6 tricksters are ) and do one full circle, depends on your killspeed but in my situation i had zero downtime!
i don't know how many peoples are farming there in high pop realms, i did it on a low pop realm and was most of th time alone..
well give it a try !