Fastest way to get slime?

Building a very large asphalt road that covers the whole map to fight the (master mode) moonlord by running away and using flying dragon to hit the core of the moonlord.

i can buy heart lanterns from the princess in celebration10mk world, I can get the campfires with torches sold from the merchant and the sunflowers from dryad but I have no idea how to get a decent supply of slime other than just sit at my mob farm and it is a very slow process that I don't want to sit through for.