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Comparision GO vs C

From the below stats it appears Go is ~10X farter than C version

Golang (rango) - 146.98s

➜  raytracer git:(develop) ✗ time ./raytracer
   Tracing started, Rays: 1228800, TriangleCount: 724, Recursion: 2
   Tracing done
   Writing image to disk
   Done writing the file to disk
   ./raytracer  146.98s user 6.28s system 99% cpu 2:33.44 total

C (bnaveenkr/raytracer) - 1017.86s

➜  raytracer git:(master) time ./a.out
Image: output.ppm, Size: 1280x960
Initial Ray Count: 1228800, Triangle Count: 724, Recursion Depth: 2
Raytracing...
Done, writing image...
Done
./a.out  1017.86s user 1.57s system 99% cpu 17:01.15 total

C with -Ofast (bnaveenkr/raytracer) - 78.93s

➜  raytracer git:(master) time ./a.out
Image: output.ppm, Size: 1280x960
Initial Ray Count: 1228800, Triangle Count: 724, Recursion Depth: 2
Raytracing...
Done, writing image...
Done
./a.out  78.93s user 0.19s system 99% cpu 1:19.30 total