It looks to me like the lowest hanging fruit in terms of reducing the program's run time is in the PPM output code. https://github.com/sol-prog/async_tutorial/

It looks to me like the lowest hanging fruit in terms of reducing the program's run time is in the PPM output code. https://github.com/sol-prog/async_tutorial/blob/master/ppm.cpp#L104 https://github.com/sol-prog/async_tutorial/blob/master/ppm.c... Three calls to ostream::write() for each and every pixel. oof.