UK 737NG operator - we've recently changed from cost index 35 to cost index 10. This gives a 250kt descent speed from TOC but we are instructed by management to changeover to 270kts which makes it more sensible.

Cost index....
 

Just for a bit of fun, try putting '999' into your cost index page, and see what you get. I know the boeing book says its fmc ranges from 0 - 200 but trust me '999' will get you home seriously quick!

it basically flys on the barbers pole for the whole flight, from T/O to final approach when you have hopefully, caught up with, slowed down and are about to land the beast