Question for Slush:

In describing the logic/calculation of the score-based system, you mentioned this:

====
Matematically said, for every submitted share, pool perform

Code:
score = score + exp(round_time/C)

round_time is count of seconds between "now" and time when round started, C is magic constant which define how fast old shares lose their value. All following calculations are using C=300, but it may be changed in the future to provide the best cheatproof/usability ratio.

And on the end of round, system calculate rewards using formula

Code:
reward = user score total score * 50
====

Is it really done for EVERY submitted share for EVERY user? that's a lot of calculations, no? or is there some other interval used to calculate the scores? maybe the scores are calculated at the end of each round?

please enlighten....