Procs Per Minute
Procs Per Minute (PPM) is the "average" number of times per minute an enhancement's special effect will attempt to fire. This mechanic is used exclusively by attuned enhancements. Invention System enhancements continue to utilize a flat percentage chance per power execution.
Procs Per Minute are calculated off the base recharge + activation time of a power, not its final enhanced or buffed number. So a power that takes 12 seconds to recharge and activate will have the same PPM as the same power enhanced and buffed enough to halve its recharge.
Changes to Procs Per Minute will be coming in Issue 24 that will invalidate the current functionality of these procs. Due to the nature of the beta process, the changes will be constantly fluctuating and thus these changes will not be listed in Paragon Wiki until they have been more concretely finalized. There is a discussion thread in the Developers' Corner section of the Official Forums, where Phil "Synapse" Zeleski announced the upcoming changes.
In addition, when this change comes, all enhancement procs will utilize PPM, not just attuned enhancements.
All of the information in this article pertains to the current functionality of Procs Per Minute.
Calculating Chance to Proc
The current formulae used by the game:
If power is a click: PPM * ((Base Recharge Time + Time To Activate) / (60 * Area Factor))
If power is not a click: PPM * ((Activate Period) / (60 * Area Factor))
| Editor's Note:|
According to the functional description of the PPM expressions Synapse provided, they are incorrect as he wrote them. The expressions as written above indicate the correct locations for the parentheses to create the order of operations he describes.
When accounting for powers that potentially can effect multiple targets and the proc potentially hitting off each target, the game discounts the probability of proc-ing off any one target by an Area Factor. The current way to calculate this number:
Area Factor = 1+(0.15*Radius)-(0.011*Radius*(360-Arc)/30)
Two things to note here:
- Single target powers have a radius of 0 which collapses the Area Factor to 1.
- Area Factor applies regardless of how many you actually hit. When using AoE and cones on single targets, proc performance will be significantly lower than with comparable single target powers.
The formula for calculating the required recharge + activation time to achieve a 100% proc chance is 60/PPM. For instance, if an enhancement has a 5PPM rate, then 60/5=12 seconds; a power with a base recharge + activation time of 12 seconds will guarantee a proc every time it executes, even if the power's final recharge is less. If an enhancement has a 1.5PPM rate, then a power needs a base recharge + activation time of 40 seconds to guarantee a proc.
Note that non-click powers cannot change their "activate period", so their chance to fire will always be the same, even if the power can be slotted or buffed with recharge.
|1PPM||60 seconds||4PPM||15 seconds|
|1.5PPM||40 seconds||4.5PPM||13.33 seconds|
|2PPM||30 seconds||5PPM||12 seconds|
|2.5PPM||24 seconds||5.5PPM||10.91 seconds|
|3PPM||20 seconds||6PPM||10 seconds|
|3.5PPM||17.14 seconds||6.5PPM||9.23 seconds|
Cone/Area of Effect
The formula for calculating the required recharge + activation time to achieve a 100% proc chance is (60 * Area Factor)/PPM, where Area Factor is 1+(0.15*Radius)-(0.011*Radius*(360-Arc)/30). Note that when Arc is 360 degrees (which is true for any non-Cone AoE) the Area Factor simplifies to 1+(0.15*Radius).
A refactored equation for the Area Factor which converts the decimal fractions into long-form with a single linear order of operations and no decimals is (((((Arc-360)*11)+4500)/30000)*Radius)+1.