I'm guessing that your management passed down some new brilliant fuel conservation profile? It seems, in the last few months, that EVERYTIME we fly into an airport that is served by Southwest, the controllers slow us down over 100 miles out. I'm not talking about 10-20 kts but its always slow to less than 250. Our normal descent speed is .82 to 360kts. With fuel prices the way they are, this delay (10+ minutes) is actually costing us money. I understand using your fuel profile into some of the more podunk places, but is it really necessary into the busier airports? Just saying that it's starting to get old.