Are you referring to the Haunting of Harrowstone? If so, here's a number of suggestions you can try to keep the speed up:
- When running the first five events, keep in mind that the timing for them is flexible. It's possible for players to hit events 1-4 on the same day, possibly even in sequence if you route them correctly. The timing on the fifth event can even be in the evening of that same day, game wise - the advantage of slamming them together keeps the pace up.
- Allow the players to purchase haunt siphons. In the AP proper, they get four during Part 2, literally moments before Part 3 starts. There's some merit in just giving them four when starting at Part 3. This is especially attractive if you don't have any other haunt killers, but a lot of the haunts (all of the important ones, too) in this AP have multiple kill methods so it's not strictly necessary. It's in that grey area between RAW and RAI though.
- Use computerized initiative. With the way haunts work, have all your players provide their initiative bonuses and then let a spreadsheet or app roll the initiatives together every time they trigger a haunt. As there's haunts EVERYWHERE in this AP, you will save a lot of time and boredom rolling initiative every freaking time they trip a haunt. You'll need to discuss this method with players before hand though so they are aware.
