I've found that if you don't cold crash your beer before siphoning it off, you'll want to let it sit for a day or two before siphoning it to ensure that all the trub at the bottom of the carboy/bucket has settled out. This means that if you didn't refrigerate your beer before siphoning to secondary or your bottling bucket, you'll want to move it to where you will siphon, and let it sit for a day or two. If you do cold crash your beer, an hour should be adequate since it seems to stick to the bottom a bit better at lower temperatures. This should give adequate time for all the trub to settle back down at the bottom, and reduce waste.
Also, make sure if it's a glass carboy, or clear plastic that it's concealed from any light while it's sitting in its siphoning location as to not skunk the beer. Finally, when you go to siphon, prop the back of the carboy/bucket up with a book or something to get the bucket to sit on an angle, so that you can maximize your return on beer without having to jam your siphon into the trub at the bottom.