By Crestington CON_CEO:
Based on visual observation orphans do not seem to matter with percentage based POS mining in perpetuity because if you miss one block your weight seem to stay the same and you will get that block reward or close to it with a next block soon after the orphan. Over time the POS reward has to add up to the coin design of a certain % per year. The last example is similar to closing your wallet for a week and opening it again for staking and then getting a large block reward to bring your POS rewards in line with the coin POS reward design. Since PayCon falls in the second category orphans do not really mind as long as you get a few blocks once in a while.
You can remove the orphans from the menu, Tools -> repair wallet.
I know all that... I have been staking pos coins since they are alive. CON is the ONLY coin to give me such a ridiculous orphan rate as high as that.
Also CON has a huge problem with performance using too much resources and cannot handle lots of blocks in same wallet.dat at certain point it will crash and make the wallet so slow and laggy that I cant use it.