Guys, despite the fact that I think that something is wrong with btc vardiff implementation, I personally think that eleuthria is one of the best pool admins around, and basically I do think that whatever he says is mostly 99% truth, so, whenever he says one thing is like that, most of the time that's the truth, so, just chill and wait..
What do you think is wrong with vardiff implementation? Current settings are it will double your difficulty if your shares per minute is above 40. Which means:
Difficulty 1 for users that are between 0 MH/s and 2800 MH/s..
Difficulty 2 for users that are between 2800 MH/s and 5600 MH/s.
Difficulty 4 for users that are between 5600 MH/s and 8400 MH/s.
This is on a per-connection basis, so if you have multiple copies of mining software open, but each one is running separately (instead of through a stratum proxy), the vardiff is applied to each miner. This gives an expected SPM range of 20-40, the average being 30. This is the highest SPM target of any other pool at the moment, chosen specifically because it provides very little variance even in a small window (15-30 minutes). Obviously this only applies to Stratum. There is no vardiff for getwork and never will be.