diff --git a/Cargo.toml b/Cargo.toml
index e3cefc8..a5b8768 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,3 +16,10 @@ chrono = "0.4.19"
 derive_builder = "0.10.0"
 quick-xml = "0.22.0"
 url = "2.2.1"
+
+[dev-dependencies]
+criterion = { version = "0.3.4", features = ["html_reports"] }
+
+[[bench]]
+name = "benchmark"
+harness = false
diff --git a/benches/benchmark.rs b/benches/benchmark.rs
new file mode 100644
index 0000000..1132d23
--- /dev/null
+++ b/benches/benchmark.rs
@@ -0,0 +1,64 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use sitewriter::*;
+
+fn benchmark(c: &mut Criterion) {
+    use chrono::Utc;
+
+    let urls = vec![
+        // Builder pattern
+        UrlEntryBuilder::default()
+            .loc("https://domain.com".parse().unwrap())
+            .priority(0.2)
+            .build()
+            .unwrap(),
+        // Using new
+        UrlEntry::new(
+            "https://domain.com/some_url".parse().unwrap(),
+            None,
+            None,
+            None,
+        ),
+        // Initializing the struct.
+        UrlEntry {
+            loc: "https://domain.com/another".parse().unwrap(),
+            priority: None,
+            changefreq: Some(ChangeFreq::Always),
+            lastmod: None,
+        },
+        UrlEntry {
+            loc: "https://domain.com/url".parse().unwrap(),
+            changefreq: Some(ChangeFreq::Daily),
+            priority: Some(0.8),
+            lastmod: Some(Utc::now()),
+        },
+        UrlEntry {
+            loc: "https://domain.com/aa".parse().unwrap(),
+            changefreq: Some(ChangeFreq::Monthly),
+            priority: None,
+            lastmod: None,
+        },
+        UrlEntry {
+            loc: "https://domain.com/bb".parse().unwrap(),
+            changefreq: None,
+            priority: None,
+            lastmod: None,
+        },
+        UrlEntry {
+            loc: "https://domain.com/bb&id='<test>'".parse().unwrap(),
+            changefreq: None,
+            priority: Some(0.4),
+            lastmod: None,
+        },
+    ];
+
+    c.bench_function("generate_str", |b| {
+        b.iter(|| Sitemap::generate_str(black_box(&urls)))
+    });
+
+    c.bench_function("generate_bytes", |b| {
+        b.iter(|| Sitemap::generate_bytes(black_box(&urls)))
+    });
+}
+
+criterion_group!(benches, benchmark);
+criterion_main!(benches);