diff --git a/stim/cuda/spider_cost.cuh b/stim/cuda/spider_cost.cuh
index 119cd82..c2821fe 100644
--- a/stim/cuda/spider_cost.cuh
+++ b/stim/cuda/spider_cost.cuh
@@ -8,6 +8,7 @@
 #include <stim/visualization/colormap.h>
 #include <sstream>
 #include <stim/math/vector.h>
+#include <stim/cuda/cudatools/timer.h>
 #include <stim/cuda/cudatools/devices.h>
 #include <stim/cuda/cudatools/threads.h>
 #include <stim/cuda/cuda_texture.cuh>
@@ -120,9 +121,18 @@ namespace stim{
 	{
 
 		//Bind the Texture in GL and allow access to cuda.
+//		#ifdef TIMING
+//			gpuStartTimer();
+//		#endif
 		t.MapCudaTexture(texbufferID, texType);
+//		#ifdef TIMING
+//			std::cout << "      " << gpuStopTimer();
+//		#endif
 
 		//initialize the return arrays.
+//		#ifdef TIMING
+//			gpuStartTimer();
+//		#endif
 		float* output;	
 		output = (float* ) malloc(DIM_Y*sizeof(float));
 
@@ -133,14 +143,26 @@ namespace stim{
 		//variables for finding the min.
 		float mini = 10000000000000000.0;
 		int idx = 0;
+//		#ifdef TIMING
+//			std::cout << "      " << gpuStopTimer();
+//		#endif
 	
 		//cuda launch variables.
+//		#ifdef TIMING
+//			gpuStartTimer();
+//		#endif
 		dim3 numBlocks(1, DIM_Y);
 		dim3 threadsPerBlock(dx, dy);
 
-
 		get_diff <<< numBlocks, threadsPerBlock, dx*dy*sizeof(float) >>> (t.getTexture(), result, dx, dy);
-
+		cudaDeviceSynchronize();
+//		#ifdef TIMING
+//			std::cout << "      " << gpuStopTimer();
+//		#endif
+
+//		#ifdef TIMING
+//			gpuStartTimer();
+//		#endif
 		HANDLE_ERROR(
 			cudaMemcpy(output, result, DIM_Y*sizeof(float), cudaMemcpyDeviceToHost)
 			);
@@ -151,7 +173,13 @@ namespace stim{
 				idx = i;                                          
 			}
 		}
+//		#ifdef TIMING
+//			std::cout << "      " << gpuStopTimer();
+//		#endif
 
+//		#ifdef TIMING
+//			gpuStartTimer();
+//		#endif
 //		stringstream name;      //for debugging
 //		name << "Test.bmp";
 //		stim::gpu2image<float>(print, name.str(),16,218,0,256);
@@ -161,6 +189,9 @@ namespace stim{
 		ret[0] = idx; ret[1] = (int) output[idx];
 //		std::cout << "The cost is " << output[idx] << std::endl;
 		free(output);
+//		#ifdef TIMING
+//			std::cout << "      " << gpuStopTimer() << std::endl;
+//		#endif
 		return ret;
 	}
 
--
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