When bard swarming the only problem you will have is when the dots land, it lags you then because of the amount of info sent to you. Just make sure you know your limits and do not have logs on. If you keep your /log on it saves this info to a file and it will kill you above 30 mobs no matter how bad 4$$ your pc is. I have helped lower end pc barders in the past and they can run 30-40 mobs just fine. If you are after record pulls do not bother on a lower end pc.
Remember /log off is your friend as a swarming bard.
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