SN-0794 已核对来源，附原文与上下文。
Laszlo 发现开启更多优化能把性能提高约 20%，所以 0.3 比 0.2.0 的哈希速度快 20%，但我猜他自己的构建里已经用了。
Laszlo figured out that enabling some more optimisation increased performance about 20%, so 0.3 hashes 20% faster than 0.2.0, but I assume he used that in his own build.
30khash 的提升是相对什么总速率？（好算百分比）
30khash increase to what total rate? (to figure the % increase)
