I agree that it is great to see the improvements. However, in the absence of comparisons to other libraries, it is tough to see the real impact. Even a comparison to the 1.x version would be helpful.

The concern is that relative to 3.0, it is improved... but relative to 1.x or a different library, it is not scalable.

The problem is not the performance of the low-level crypto code IMHO, but how it interfaces with the rest, which is where you're crossing a myriad of locks (and atomic ops for newer versions) that cost a lot as soon as you're interested in using more than one CPU core :-/