from telegram From Ivan: 'Primecoin nodes on pools xpmforall.org and coinsforall.io has updated and now include bnPrimeChainMultiplier in headers.. its can be block source for Electrum and primecoin-core 0.16 wallets
After 4-5 days will be released new miner xpmclient 10.3 with speedup 3-12% for all cards"