Current waiting times for visa processing without an expediter (sending it directly to the consulate yourself) are somewhere around 30-45 working days. But waiting times with an expediter can be as little as 24-48 hours (or up to about 4-5 working days if the consulate is busy).
If you use an expediter (by locating one close to the consulate you are applying to and then sending your documents to them), then your application gets put right to the top of the processing pile and is processed almost right away, but if you don't use an expediter, then your application gets put to the bottom of the pile and you have to wait until they have processed all the expedited applications and all the mailed-in applications in front of yours first.
If you need your visa in a hurry, or you don't want to be waiting around for several weeks wondering if your visa will be approved or not, then an expediter is the way to go
.