Fast pass is designed for a perfect world. It is SOP for 60% of capacity to be allotted to FP. When I say perfect if you have an attraction with capacity of 1000. 600 of those spot are allotted in five minute increments. So theoretically 50 people should arrive every five minutes and the remaining 33.3 spots move from the standby line. However fast pass works in a real world where several factors can change the planned ratio:
1. Capacity decreasing due to numerous reasons. Loading delays. Unloading delays. Guest caused ride stops. Automatic ride stops etc
2. FP guest arriving in uneven patters. Say the first 5 minutes instead of 50 ppl arriving only 25 do. So you fill by taking standby guests and let's saying this continues for 30 minutes. Then the back half of the hour everyone is doubled up so now you have 75 FP guests arriving every five minutes. So now the ride is taking 75/8 FP/standby
3. Then the unplanned chaos: Rider switch / DAS / 15 minute late grace / 5 minute early grace / exceptions for dining runovers / automatic downtime recovery for which ppl use a FP for a down attraction at a recovery one / re-admittance tickets for when guests are ecvacuated. These multiple scenarios are unplanned and not built into the perfect world of fast pass.
Ultimately fast pass is designed for a perfect park experience. However the parks operate in a real world which cause unplanned ebb and flow in the queueing experience. It is a great design in theory but In operation it's an untamed beast where the actions of guests inside the park create the environment which they experience.
1. Capacity decreasing due to numerous reasons. Loading delays. Unloading delays. Guest caused ride stops. Automatic ride stops etc
2. FP guest arriving in uneven patters. Say the first 5 minutes instead of 50 ppl arriving only 25 do. So you fill by taking standby guests and let's saying this continues for 30 minutes. Then the back half of the hour everyone is doubled up so now you have 75 FP guests arriving every five minutes. So now the ride is taking 75/8 FP/standby
3. Then the unplanned chaos: Rider switch / DAS / 15 minute late grace / 5 minute early grace / exceptions for dining runovers / automatic downtime recovery for which ppl use a FP for a down attraction at a recovery one / re-admittance tickets for when guests are ecvacuated. These multiple scenarios are unplanned and not built into the perfect world of fast pass.
Ultimately fast pass is designed for a perfect park experience. However the parks operate in a real world which cause unplanned ebb and flow in the queueing experience. It is a great design in theory but In operation it's an untamed beast where the actions of guests inside the park create the environment which they experience.