slight perf improv
slight perf improv

you21979/NBitcoin,bitcoinbrisbane/NBitcoin,lontivero/NBitcoin,NicolasDorier/NBitcoin,stratisproject/NStratis,dangershony/NStratis,thepunctuatedhorizon/BrickCoinAlpha.0.0.1,MetacoSA/NBitcoin,HermanSchoenfeld/NBitcoin,MetacoSA/NBitcoin