diff --git a/src/seam-carving.cpp b/src/seam-carving.cpp
index 92caa67..80f3fd9 100644
--- a/src/seam-carving.cpp
+++ b/src/seam-carving.cpp
@@ -15,9 +15,7 @@
 bool silent;
 bool test_energy;
 
-int min(int a, int b) {
-  return a < b ? a : b;
-}
+#define min(a, b) { (a < b ? a : b) }
 
 bool nearly_equal(float a, float b) {
   return std::nextafter(a, std::numeric_limits<float>::lowest()) <= b
@@ -110,9 +108,9 @@ std::vector<int> optimal_vertical_seam(std::vector<float> energy, int width, int
     
     //Idea : float next_energy = min_val - energy[width*i + min_idx];
     //! With floats, we don't always have x + y - y == x, so we check is x+y == x+y
-    auto is_next_idx = [=](int idx) {
-      return nearly_equal(dyn_energy[(i-1)*width + idx]+energy[width*i + min_idx], min_val);
-    };
+    // This define is a bit ugly but 200x faster than using a lambda function
+    #define is_next_idx(idx) \
+        (dyn_energy[(i-1)*width + idx]+energy[width*i + min_idx] == min_val)
 
     if (is_next_idx(min_idx)) {
       // min_idx does not change