Performances of Pyhton programs

[François Baire]

Are there any benchmark or does anoyone know what are the performances of a 
program written in python (in terms of CPU and RAM) compared with other 
languages (especially C++ and compiled languages) ?
   I've met many articles which explain that python programs are slowler 
because it uses the interpreter, but none says how much slower it is ! I 
would like to know this for a rather big OO program which uses standard 
fonctions of the language.
Thanks

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François Baire