It is instant & anonymous* in transacting a premixed balance.
* Provided there is an anonymous IP solution as well which I would prefer if it was offered out-of-the-box.
Premixing a balance takes a ridiculous amount of hours/days/weeks depending on how much you're mixing. Dash is marketed as 'instant & anonymous', not 'instant & anonymous if you premix'. This is why it's a dishonest solution for users seeking privacy.