There's not much of a way around it, and trying to rush through it really isn't going to do much for you.

If you really want to, then finger her and play with her clit, and tease her before you actually go down. She'll be more aroused, and more able to cum.

Really, it depends on the girl,
but I'm sure the taste isn't that great.
But either is sucking your dick, so it's a tie.

Your fingers inside her will do a whole lot more for her than your tounge will, keep that for the clit.