When you come out of a turn of a windward mark and a good number of the fleet are still behind you, your big effortshould be getting and keeping clear wind in your sails. As the figure shows, you will be going some what downwind from the mark and all of the boats behind you will be rounding the mark and dump a poor wind blanket at you.
So when you come out of the turn, angle away from the mark to find clear air. That is if you're outside, swing wide to be windward of the following boats on the outside of the course. If you're inside, sail in a bit extra to get away from being dead downwind of the mark.