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For a long time, third party programs in Guild Wars 2 have been taboo of sort, with anything that reads the game’s memory being a straight up ban for anyone who uses it. Overlays, and some helpful add ons have been around for a while to make life easier, but the biggest place this hit was in trying to measure DPS. Recently, ArenaNet have made an exception in this case, allowing DPS meters to be a part of the game.