Left my somewhat optimized version running over night and came back to 3 additional blocks mined.
Getting roughly ~60 pps with 500K sieve size and basic optimization flags. Running on a single thread of a stock i3 2120.
I tried ommiting two zeroes from nMaxSieveSize and got ~400-800 pps using 6 cores of an old i7, quickly changed back to normal version though due to not finding blocks in a seconds interval.

Now i fell i must try it again, either with one or two zeroes less than normal.
