One factor is time spent on optimizing the compiler or interpreter. In addition to having its own free Python distribution, Intel produces C++ and Fortran compilers. Although it charges for those compilers, I think the main reason it has created them, even though gcc exists, is to increase peformance on its hardware.
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[ 3.2 ms ] story [ 6.9 ms ] thread- How abstract it is / what 'advanced' features it provides
- The compiler