diff --git a/src/stochastic/noise/fgn.rs b/src/stochastic/noise/fgn.rs
index 54a183a..d6714cf 100644
--- a/src/stochastic/noise/fgn.rs
+++ b/src/stochastic/noise/fgn.rs
@@ -112,6 +112,23 @@ mod tests {
     assert_eq!(fbm.sample().len(), N);
   }
 
+  #[test]
+  fn fgn_speed_test() {
+    let start = std::time::Instant::now();
+    let fbm = FGN::new(0.7, N, Some(1.0), None);
+    let _ = fbm.sample();
+    let duration = start.elapsed();
+    println!("Time elapsed in sample() is: {:?}", duration);
+
+    let start = std::time::Instant::now();
+    let fbm = FGN::new(0.7, N, Some(1.0), None);
+    for _ in 0..N {
+      let _ = fbm.sample();
+    }
+    let duration = start.elapsed();
+    println!("Time elapsed in sample() is: {:?}", duration);
+  }
+
   #[test]
   #[ignore = "Not implemented"]
   fn fgn_starts_with_x0() {