(Speed Test) Distance between 65535 points! boost vs c++std

#include <iostream>
#include <chrono>
#include <boost/geometry.hpp>

#define SIZE_DOUBLE 65535

int main() {
    auto myarray = new double[SIZE_DOUBLE][3]();
    double startd = 1.0;
    for(int t=0; t!=SIZE_DOUBLE; t++) {
        myarray[t][0] = startd;
        myarray[t][1] = 1.0;
        myarray[t][2] = 1.0;
        startd += 1.0;
    }

    std::cout << "mine ...\n\n\n" << std::endl;

    std::chrono::time_point<std::chrono::system_clock> start_time = std::chrono::system_clock::now();
    double cpoint[3], *mpoint;
    cpoint[0] = 6.0; cpoint[1] = 2.0; cpoint[2] = 1.0;
    double min_d = 65535;
    for(int t=0; t!=SIZE_DOUBLE; t++) {
        double d = std::pow((myarray[t][0]-cpoint[0]), 2) + std::pow((myarray[t][1]-cpoint[1]), 2)
        + std::pow((myarray[t][2]-cpoint[2]), 2) ;
        if (d < min_d) {
            min_d = d;
            mpoint = myarray[t];
        }
    }
    std::chrono::time_point<std::chrono::system_clock> end_time = std::chrono::system_clock::now();
    std::cout  << "Closest: (" << mpoint[0] << "," << mpoint[1] << "," << mpoint[2] << ")" << std::endl
        << "At: " << std::sqrt( std::pow((mpoint[0]-cpoint[0]), 2) +
            std::pow((mpoint[1]-cpoint[1]), 2) + std::pow((mpoint[2]-cpoint[2]), 2) ) << std::endl
        << "In: " << std::chrono::duration_cast<std::chrono::milliseconds>
            (end_time - start_time).count() << " milliseconds" << std::endl;

    std::cout << "\n\n\nboost ...\n\n\n" << std::endl;

    std::chrono::time_point<std::chrono::system_clock> start_time2 = std::chrono::system_clock::now();
    typedef boost::geometry::model::point<double, 3, boost::geometry::cs::cartesian> mypoint;
    mypoint p, pv, min_p;
    boost::geometry::assign_values(p, 6.0, 2.0, 1.0);
    double min_d2 = 65535;
    for(int t=0; t!=SIZE_DOUBLE; t++) {
        boost::geometry::assign_values(pv, myarray[t][0], myarray[t][1], myarray[t][2]);
        double d = boost::geometry::comparable_distance(p, pv);
        if (d < min_d2) {
            min_d2 = d;
            min_p = pv;
        }
    }
    std::chrono::time_point<std::chrono::system_clock> end_time2 = std::chrono::system_clock::now();
    std::cout
        << "Closest: " << boost::geometry::dsv(min_p) << std::endl
        << "At: " << boost::geometry::distance(p, min_p) << std::endl
        << "In: " << std::chrono::duration_cast<std::chrono::milliseconds>
            (end_time2 - start_time2).count() << " milliseconds" << std::endl;



    std::cin.get();
    return 1;
}