EASTL versus STL, how can there be such a performance difference in std::vector::operator[]

Question

According to http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2271.html vector::operator[] is between 2% and 70% faster in EASTL than a \"comm

Answer 1

I think this passage from the documentation will be crucial

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2271.html#eastl_allocator

It is apparently inspired by the famous 'Towards a better allocator model' article by Pablo Halpern