Shared initiatives.
1. Enemies roll initiatives (I choose an average bonus and roll twice choosing highest), PC's roll initiatives.
2. Any PC's who got higher than monsters go now.
3. ALL Monsters go.
4. ALL PC's go, including those who got to go in step 2, in whatever order they want
5. Repeat 3 and 4 till done.
This...
...sped up combat for our games
...allowed the group to really work together well planning out attacks, let them get very tactical.