Get up early and get through the ledges as efficiently as possible.
A rope and protection will slow you down. If you and your partner are not comfortable soloing the ledges, you may want to reconsider. The ledges while not technically difficult are somewhat exposed.
Once past the chute, there is a nice little rock rib to stop and rope up on. I recommend putting on a rope here, if not for the chute as well. There are monster crevasses between here and the crater.
Descend a different route to avoid crossing under Gib Rock in the heat of the day.
I don't think avy gear is really necessary. If you get avalanched off of the route I wouldn't expect to live. But if you don't mind carrying the weight you can never be too safe, right?
Stay at Camp Muir. It will be the most comfortable and allows for a straight forward descent via the DC or Ingraham Direct.