According to http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2271.html
vector<uint64>::operator[]
is between 2% and 70% faster in EASTL than a "commonly used commercial version of STL".
Unless the commercial version of STL uses range checking, which would make the comparison unfair, how can it possibly be such a speed difference for such a simple operation?
Update:
Seems the answer is that the EA engineers is simply cheating by comparing with a version which uses range checking...