diff --git a/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json b/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json
deleted file mode 100644
index 3e483a2..0000000
--- a/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json
+++ /dev/null
@@ -1,515 +0,0 @@
-{
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diff --git a/internal/ceres/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json b/internal/ceres/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json
new file mode 100644
index 0000000..1798ccb
--- /dev/null
+++ b/internal/ceres/benchmarks/macbook-pro-2014-small_blas_gemv_benchmark.json
@@ -0,0 +1,515 @@
+{
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+      "cpu_time": 9.8622238711838168e+00,
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+      "name": "BM_MatrixVectorMultiply/2/2",
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+      "real_time": 1.1705572873750949e+01,
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+      "cpu_time": 1.8353143869729728e+01,
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+      "real_time": 2.1085192464583656e+01,
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+    {
+      "name": "BM_MatrixVectorMultiply/4/3",
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+      "real_time": 2.4285911482952638e+01,
+      "cpu_time": 2.4048379591849130e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixVectorMultiply/4/4",
+      "iterations": 27748598,
+      "real_time": 2.8067616677809326e+01,
+      "cpu_time": 2.5865126591260609e+01,
+      "time_unit": "ns"
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+    {
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+      "cpu_time": 2.8174005733209675e+01,
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+    },
+    {
+      "name": "BM_MatrixVectorMultiply/4/7",
+      "iterations": 23207779,
+      "real_time": 3.0391250791985073e+01,
+      "cpu_time": 2.9916649930180775e+01,
+      "time_unit": "ns"
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+    {
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+      "real_time": 4.5653321419675805e+01,
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+      "time_unit": "ns"
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+      "name": "BM_MatrixVectorMultiply/4/16",
+      "iterations": 10000000,
+      "real_time": 5.1884067698847502e+01,
+      "cpu_time": 5.1231399999999638e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixVectorMultiply/4/20",
+      "iterations": 10321743,
+      "real_time": 7.1935641875272623e+01,
+      "cpu_time": 6.9165353177268500e+01,
+      "time_unit": "ns"
+    },
+    {
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+      "iterations": 57211511,
+      "real_time": 1.2786805141388754e+01,
+      "cpu_time": 1.2007094166766615e+01,
+      "time_unit": "ns"
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+    {
+      "name": "BM_MatrixTransposeVectorMultiply/1/2",
+      "iterations": 59967446,
+      "real_time": 1.2595885590935398e+01,
+      "cpu_time": 1.2386837351719235e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/1/3",
+      "iterations": 48324853,
+      "real_time": 1.3965870500880389e+01,
+      "cpu_time": 1.3175870395301542e+01,
+      "time_unit": "ns"
+    },
+    {
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+      "iterations": 53931199,
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+      "cpu_time": 1.2395125871390313e+01,
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+    {
+      "name": "BM_MatrixTransposeVectorMultiply/1/6",
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+      "real_time": 1.7573782894920971e+01,
+      "cpu_time": 1.6465957266930783e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/1/7",
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+      "real_time": 1.7835137661432338e+01,
+      "cpu_time": 1.7324019170035765e+01,
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+      "name": "BM_MatrixTransposeVectorMultiply/1/12",
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+      "cpu_time": 1.7872739549499133e+01,
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+    {
+      "name": "BM_MatrixTransposeVectorMultiply/1/16",
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+      "real_time": 1.9690264516458388e+01,
+      "cpu_time": 1.9365940893587972e+01,
+      "time_unit": "ns"
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+    {
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+      "real_time": 2.2967801144088135e+01,
+      "cpu_time": 2.1233817993204124e+01,
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+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/2/1",
+      "iterations": 55120280,
+      "real_time": 1.3296489332225445e+01,
+      "cpu_time": 1.2641753634052581e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/2/2",
+      "iterations": 45745355,
+      "real_time": 1.5342622390806852e+01,
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+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/2/3",
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+      "real_time": 1.7288141497621908e+01,
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+    },
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+    {
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+      "real_time": 2.1433496777681615e+01,
+      "cpu_time": 2.1101808375110068e+01,
+      "time_unit": "ns"
+    },
+    {
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+      "real_time": 2.8695185282827168e+01,
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+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/2/12",
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+      "real_time": 2.5414124132552242e+01,
+      "cpu_time": 2.5012734014689062e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/2/16",
+      "iterations": 26304121,
+      "real_time": 2.7786573175356700e+01,
+      "cpu_time": 2.7248239924078774e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/2/20",
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+      "real_time": 3.1584149964122386e+01,
+      "cpu_time": 3.1010794468666266e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/3/1",
+      "iterations": 45903445,
+      "real_time": 1.5271870291696541e+01,
+      "cpu_time": 1.5023186168271270e+01,
+      "time_unit": "ns"
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+    {
+      "name": "BM_MatrixTransposeVectorMultiply/3/2",
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+      "real_time": 1.8626934482269160e+01,
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+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/3/3",
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+      "real_time": 2.1152548974519810e+01,
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+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/3/4",
+      "iterations": 36580841,
+      "real_time": 2.2141558800840450e+01,
+      "cpu_time": 2.1718254099188123e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/3/6",
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+      "real_time": 2.5637143914685403e+01,
+      "cpu_time": 2.5370575050929215e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/3/7",
+      "iterations": 25641026,
+      "real_time": 2.9056108440940619e+01,
+      "cpu_time": 2.8340402603234452e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/3/12",
+      "iterations": 21857104,
+      "real_time": 2.9318980271296027e+01,
+      "cpu_time": 2.8576201128932929e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/3/16",
+      "iterations": 21147525,
+      "real_time": 3.4772101701348014e+01,
+      "cpu_time": 3.3845851937756258e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/3/20",
+      "iterations": 18255885,
+      "real_time": 3.8151240495870312e+01,
+      "cpu_time": 3.7737693899802757e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/4/1",
+      "iterations": 41598327,
+      "real_time": 1.7972290135515205e+01,
+      "cpu_time": 1.7753334166539762e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/4/2",
+      "iterations": 34202734,
+      "real_time": 2.2089604240919805e+01,
+      "cpu_time": 2.1759722483003841e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/4/3",
+      "iterations": 27249123,
+      "real_time": 2.6488586586931632e+01,
+      "cpu_time": 2.6050122787437939e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/4/4",
+      "iterations": 30863381,
+      "real_time": 2.4542076224741049e+01,
+      "cpu_time": 2.4055303597489978e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/4/6",
+      "iterations": 23214321,
+      "real_time": 3.1091653333839805e+01,
+      "cpu_time": 3.0791294735693508e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/4/7",
+      "iterations": 21214950,
+      "real_time": 3.3605207788356317e+01,
+      "cpu_time": 3.3319333771703114e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/4/12",
+      "iterations": 21109771,
+      "real_time": 3.4236321416005268e+01,
+      "cpu_time": 3.3933669863117345e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/4/16",
+      "iterations": 17775521,
+      "real_time": 3.9990263516471948e+01,
+      "cpu_time": 3.9692563722886177e+01,
+      "time_unit": "ns"
+    },
+    {
+      "name": "BM_MatrixTransposeVectorMultiply/4/20",
+      "iterations": 14255226,
+      "real_time": 5.0482404275173749e+01,
+      "cpu_time": 4.9507808574903912e+01,
+      "time_unit": "ns"
+    }
+  ]
+}
diff --git a/internal/ceres/small_blas.h b/internal/ceres/small_blas.h
index 264ac53..a603437 100644
--- a/internal/ceres/small_blas.h
+++ b/internal/ceres/small_blas.h
@@ -304,8 +304,8 @@
 
   for (int row = 0; row < NUM_ROW_A; ++row) {
     double tmp = 0.0;
-    for (int col = 0; col < NUM_COL_A; ++col) {
-      tmp += A[row * NUM_COL_A + col] * b[col];
+    for (int col = 0; col < NUM_COL_A; ++col, ++A) {
+      tmp += (*A) * b[col];
     }
 
     if (kOperation > 0) {
@@ -353,18 +353,19 @@
   const int NUM_ROW_A = (kRowA != Eigen::Dynamic ? kRowA : num_row_a);
   const int NUM_COL_A = (kColA != Eigen::Dynamic ? kColA : num_col_a);
 
-  for (int row = 0; row < NUM_COL_A; ++row) {
-    double tmp = 0.0;
-    for (int col = 0; col < NUM_ROW_A; ++col) {
-      tmp += A[col * NUM_COL_A + row] * b[col];
-    }
 
-    if (kOperation > 0) {
-      c[row] += tmp;
-    } else if (kOperation < 0) {
-      c[row] -= tmp;
-    } else {
-      c[row] = tmp;
+  if (kOperation == 0) {
+    std::fill(c, c + NUM_COL_A, 0.0);
+  }
+
+  for (int row = 0; row < NUM_ROW_A; ++row) {
+    const double tmp = b[row];
+    for (int col = 0; col < NUM_COL_A; ++col, ++A) {
+      if (kOperation >= 0) {
+        c[col] += (*A) * tmp;
+      } else {
+        c[col] -= (*A) * tmp;
+      }
     }
   }
 #endif  // CERES_NO_CUSTOM_BLAS