When using the Chakram with the Demon Hunter in the Cathedral Level 2, if a ledge is nearby with ground below it, the Chakram will go all the way down instantly then come back up. It looks very silly. I have taken screen shots and can post them if necessary.
I don't know if this is for blizzard or amd, but I have a HD 5970 GPU and a 6 core 3.5 GHz CPU, but when the screen gets busy I lag a bit. When I check the resource usage on my GPU it is hovering around 30%. Therefore some optimization seems necessary.