diff --git a/Cargo.lock b/Cargo.lock
index 0aaa3f5..2228151 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,18 +2,186 @@
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+
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@@ -60,6 +316,7 @@ dependencies = [
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+ "criterion",
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+version = "0.3.63"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3bdd9ef4e984da1187bf8110c5cf5b845fbc87a23602cdf912386a76fcd3a7c2"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "which"
 version = "4.4.0"
@@ -137,6 +667,37 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "xshell"
 version = "0.2.3"
diff --git a/Cargo.toml b/Cargo.toml
index d39169c..2053c19 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,4 +19,4 @@ license = "MIT OR Apache-2.0"
 debug = 0
 
 [profile.release]
-strip = true
\ No newline at end of file
+strip = true
diff --git a/crates/mybin/Cargo.toml b/crates/mybin/Cargo.toml
index 65d511b..c14dfa5 100644
--- a/crates/mybin/Cargo.toml
+++ b/crates/mybin/Cargo.toml
@@ -13,5 +13,9 @@ license.workspace = true
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[[bin]]
+name = "mybin"
+bench = false  # allows passing arguments through to criterion
+
 [dependencies]
 mylib = { path = "../mylib" }
diff --git a/crates/mylib/Cargo.toml b/crates/mylib/Cargo.toml
index edce54d..292cd11 100644
--- a/crates/mylib/Cargo.toml
+++ b/crates/mylib/Cargo.toml
@@ -13,5 +13,15 @@ license.workspace = true
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[lib]
+bench = false  # allows passing arguments through to criterion
+
+[[bench]]
+name = "my_benchmark"
+harness = false
+
 [dependencies]
 rand = "0.8.5"
+
+[dev-dependencies]
+criterion = { version = "0.4.0", features = ["html_reports"] }
diff --git a/crates/mylib/benches/my_benchmark.rs b/crates/mylib/benches/my_benchmark.rs
new file mode 100644
index 0000000..cbbc8aa
--- /dev/null
+++ b/crates/mylib/benches/my_benchmark.rs
@@ -0,0 +1,10 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+use mylib::fibonacci;
+
+pub fn criterion_benchmark(c: &mut Criterion) {
+    c.bench_function("fib 20", |b| b.iter(|| fibonacci(black_box(20))));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);
diff --git a/crates/mylib/src/lib.rs b/crates/mylib/src/lib.rs
index fb84687..824f0d3 100644
--- a/crates/mylib/src/lib.rs
+++ b/crates/mylib/src/lib.rs
@@ -13,6 +13,36 @@ pub fn shuffle_array(nums: &mut [i32]) {
     nums.shuffle(&mut rng);
 }
 
+// Example fib functions for benchmarking.
+
+// #[inline]
+// #[must_use]
+// pub fn fibonacci(n: u64) -> u64 {
+//     match n {
+//         0 => 0,
+//         1 => 1,
+//         n => fibonacci(n - 1) + fibonacci(n - 2),
+//     }
+// }
+
+#[inline]
+#[must_use]
+pub fn fibonacci(n: u64) -> u64 {
+    if n == 0 {
+        return 0;
+    }
+
+    let mut a = 0;
+    let mut b = 1;
+
+    for _ in 1..n {
+        let c = a + b;
+        a = b;
+        b = c;
+    }
+    b
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -21,4 +51,9 @@ mod tests {
     fn test_add() {
         assert_eq!(add(10, 32), 42);
     }
+
+    #[test]
+    fn test_fibonacci() {
+        assert_eq!(fibonacci(20), 6765);
+    }
 }
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index d348299..cd662cf 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -8,6 +8,10 @@ publish = false
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[[bin]]
+name = "xtask"
+bench = false  # allows passing arguments through to criterion
+
 [dependencies]
 anyhow = "1.0.71"
 is_ci = "1.1.1"