From post #1...
"SPLNS calculation is done on the fly and updated every minute based as a product of HERP DERP.
Herp stands for Hash Extracted Rate Product - where each share is worth sqrt(MIN(share diff, network_diff) / work_diff) * work_diff / 2
Derp stands for Difficulty Extrapolated Reward Payment - where the reward equals the user's herp divided by the pool's herp.
The pool's Herp is simply added until it reaches 5 * network difficulty. After that it is biased every minute by scaling existing herp down to add the latest minute's herp and all users' herp is adjusted by the same scale the pool's was."
P.s. Landy1264 - thank you. Like I said informative little pool here.