If at the windward mark we are rounding very close to several boats that either we want to roll or theyre in danger of rolling us I use this tactic as does mean you can get up and going a bit quicker, if it is getting very windy then I jump in due to make the mark rounding easier.
If there are no boats around we find that we usally go round and I come off the wire and take as much depth as possible while the crew is hoisting the kite to make it as easy as possible.

Also do it when we are gybe setting as it means I can can jump out on the wire quicker than the crew can.