It's usually referred to as "Arcanatime". The formula is
Arcanatime = 0.132 x ( roundup(cast/0.132) + 1)
What it means is that when you use a power, the server performs the animation, but it doesn't do anything else until the end of the server tick (the roundup part). Then, it has to wait another server tick for the server to say it's ready for the next attack (the +1). According to Arcanaville's testing, the length of a server tick is 0.132 seconds.
I have a spreadsheet that has Arcanatime and the "real" DPA of every Scrapper attack calculated, but I don't remember where I got it from. Somebody else may post one, but if not, the math isn't hard with a calculator.
Arcanatime = 0.132 x ( roundup(cast/0.132) + 1)
So
smite=1.188
SL=2.112
SP=1.056
So 1.056+1.188+2.112+1.056+1.188=6.6
"All right, they're on our left, they're on our right, they're in front of us, they're behind us...they can't get away this time"- Chesty Puller US Marine Corps
Shadow Punch: .83 secs >> 1.056 secs
Smite: .97 secs >> 1.188 secs
Siphon Life: 1.93 secs >> 2.112 secs
2 Shadow Punch + 2 Smite + 1 Siphon Life = 6.6 secs
What is the actual attack chain speed of the following:
Shadow Punch-Smite-Siphon Life-Shadow Punch-Smite
Using the exact cast time numbers it is 5.53s...but isn't there an actually calculated time because of certain game pauses?
I believe this was something brought up by Arcana.