It might help if you do a better way of bookkeeping for initiative. For instance, a dry-erase board makes it easy to keep track of things. Also, I've found that if you group mooks into a single initiative, it goes quicker. Say Gangers 1-6 all have the same init dice and bonus, because they're generic gangers. Much easier to have them all on the same pass, and run with it. Breaks down a little on interrupt actions, but can still work without too much trouble.