Seems similar on my system. Some more comparisions:

Waf written in Python:

    $ time ./waf --version >/dev/null

    real 0m0,068s
    user 0m0,056s
    sys 0m0,012s

Ninja written in C++:

    $ time ninja --version >/dev/null

    real 0m0,001s
    user 0m0,001s
    sys 0m0,000s