Very slow on rpi2 raspbian about openvg HOT 2 CLOSED

//  OpenVG benchmark
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <shapes.h>
#include <time.h>

#include <sys/time.h>

int main() {

    int width, height;
    VGfloat w2, h2, w;
    init(&width, &height);                                      // Graphics initialization

    w2 = (VGfloat)(width/2);
    h2 = (VGfloat)(height/2);
    w  = (VGfloat)w;
    int circ_size = 0;

    Start(width, height);                                       // Start the picture
    Background(0, 0, 0);                                        // Black background
    Fill(255, 255, 255, 1);                                     // White text
    TextMid(w2, h2, "hello, world", SerifTypeface, width/10);   // Greetings
    Fill(44, 77, 232, 1);                                       // Big blue marble
    struct timeval start, stop;
    double elapsed = 0.0;
    while (circ_size < w2) {
        circ_size = (circ_size + 10) % width;
        gettimeofday(&start, NULL);
        Circle(w2, 0, circ_size);                              // The "world"
        End();
        gettimeofday(&stop, NULL);
        elapsed = (double)(stop.tv_usec - start.tv_usec) / 1000000 + (double)(stop.tv_sec - start.tv_sec);
        printf("Elaspsed = %.6f\n", elapsed);
    }
    finish();                                                 // Graphics cleanup
    exit(0);
}

printf("Loop iteration: %lldms\n", end - start);