Not when formatting is involved. stdio and iostreams are notoriously not particularly fast when it comes to formatting. So, while I don't know anything about th

Not when formatting is involved. stdio and iostreams are notoriously not particularly fast when it comes to formatting. So, while I don't know anything about this particular library, the 6x figure does not sound suspicious to me. Source: have spent a fair amount of time working on speeding up human-readable log output, the performance of which tends to be dominated by formatting.