i have a question, we can only use 6 skills in the game, the problem is can we change the skill anytime once we entered it? or it is locked or require a skill reset?

anyone tried witch doctor in beta? do the summons cause a lot of lag? i am still unable to decide which class to go for...wanted to play witch doctor but worried of lag, or maybe im gonna play monk...

here is my rig, playable or not? please tell me if it's totally unplayable so i can get a new pc before the game launch