The champions have struggled for consistency under their new manager, winning five of their last six league games but seeing that run punctuated by three successive defeats in three different competitions.
United currently trail fourth-place Liverpool by five points and are a further six adrift of table-topping Arsenal, but Van Persie, who will miss this weekend’s trip to Stamford Bridge for a grudge match against Chelsea with a groin injury, believes Moyes requires time to turn things around.
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"We lost too many points this year, but we are doing everything we can to change that."
Although hopes of defending their Premier League crown appear to be all but over, Van Persie is keen to ensure the winning culture that was established under Sir Alex Ferguson is maintained under Moyes.
He added: "We are used to winning. If you win, it's a normal day at the office. After the Community Shield win, none of the players really celebrated, or played music, as it was the way things were."