It seems bar swapping is server sided so, if you have 500 ping, you will have to wait half a second to bar swap. This is a real problem in pvp, where battles often get laggy and all your heals are on your back bar. I'm not sure I understand everything about it but I think it could be good to make it client sided : no delay when bar swapping so you can cast a heal instead of waiting for half a second. It would probably also slightly reduce stress on the server. The only problem I can see with doing that would be that some players could bypass the slight cooldown there is when bar swapping, allowing them to do stuff like being permanently on their back bar and quickly swapping to the front bar to attack and then go back to the back bar, but even then it should be possible to detect things like that. What do you think ? Is there a reason to keep bar swapping server sided that I'm not seeing ? Is bar swapping already client sided ?