same here. All i/o libraries eventually hit OS barrier. I can't really see how it could be optimised to gain 6x speed up. I/O libraries are basically transporters between userland and kernel space.
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.
Indeed.
> I can't really see how it could be optimised to gain 6x speed up.
Performance claims appear to not even be based on I/O but only on two formatting microbenchmarks and are severely misleading https://news.ycombinator.com/item?id=23311726