diff --git a/benches/benches.rs b/benches/benches.rs
index 3167106..f3ac035 100644
--- a/benches/benches.rs
+++ b/benches/benches.rs
@@ -51,6 +51,17 @@ fn criterion_benchmark(c: &mut Criterion) {
             ]
         })
     });
+    c.bench_function("Macro init grid from_vec", |b| {
+        b.iter(|| {
+            let vec = vec![
+                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7,
+                8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5,
+                6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3,
+                4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
+            ];
+            Grid::from_vec(vec, 10)
+        })
+    });
     c.bench_function("Macro init grid", |b| {
         b.iter(|| {
             grid![[0,1,2,3,4,5,6,7,8,9]
diff --git a/src/lib.rs b/src/lib.rs
index 5875e8e..d7d8d92 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -40,17 +40,21 @@ macro_rules! grid {
     ( [$( $x0:expr ),*] $([$( $x:expr ),*])* ) => {
         {
             let mut _assert_width0 = [(); $crate::count!($($x0)*)];
-            let mut vec = Vec::new();
+            
             let cols = $crate::count!($($x0)*);
-
-            $( vec.push($x0); )*
+            let rows = 1usize;
 
             $(
                 let _assert_width = [(); $crate::count!($($x)*)];
                 _assert_width0 = _assert_width;
-                $( vec.push($x); )*
+                let rows = rows + 1usize;
             )*
 
+            let mut vec = Vec::with_capacity(rows * cols);
+
+            $( vec.push($x0); )*
+            $( $( vec.push($x); )* )*
+
             $crate::Grid::from_vec(vec, cols)
         }
     };