There are some peculiarities with the `with` statements, but mainly it is just dog-slow compared to a standard lookup. Last time I checked it was 200-300 times

There are some peculiarities with the `with` statements, but mainly it is just dog-slow compared to a standard lookup. Last time I checked it was 200-300 times slower to use the `with` statement rather than just doing an `obj.key` lookup. If nothing else, surely it should be avoided in production purely for performance reasons.