I did not perform bench marking, But can get idea from following
Although implemented in C++, Wt’s main focus or novelty is not its
performance, but its focus on developing maintainable applications and
its extensive library of built-in widgets. But because it is popular
and widely used in embedded systems, you will find that performance
and foot-print has been optimized too, by virtue of a no-nonsense API,
thoughtful architecture, and C++ …
I did not perform bench marking, But can get idea from following
given in webtoolkit tutorial