I have released Mouse 0.42 "Mouse::XS". http://search.cpan.org/dist/Mouse/ From this version, Mouse generates constructors, destructors, and accessors in XS. These generated mehtods are much faster than pure Perl methods, especially in attributes with type constraints. How fast is it? Accoding to a benchmark for HTTP::Engine, Mouse::XS is about 100% faster than Mouse::PurePerl in command line appl
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