diff --git a/src/main/rust/src/implementations/libraries.rs b/src/main/rust/src/implementations/libraries.rs
index eef6256..a055ba9 100644
--- a/src/main/rust/src/implementations/libraries.rs
+++ b/src/main/rust/src/implementations/libraries.rs
@@ -17,7 +17,8 @@ pub fn run() {
     let mmap_ptr = mmap.as_ptr();
     let file_length = mmap.len();
     let hasher = FxBuildHasher;
-    let mut stations: HashMap<u64, (String, StationMeasurements)> =
+    // Even if I could now just use the byte slice as a key, doing the hash is still faster
+    let mut stations: HashMap<u64, (&[u8], StationMeasurements)> =
         HashMap::with_capacity_and_hasher(DEFAULT_HASHMAP_LENGTH, hasher);
     let (tx, rx) = mpsc::channel();
     let cores = thread::available_parallelism().unwrap().into();
@@ -43,7 +44,7 @@ pub fn run() {
             let (start, end) = *bounds.get(i).unwrap();
             let mmap_slice = unsafe { from_raw_parts(mmap_ptr.add(start), end - start) };
             s.spawn(move || {
-                let mut t_stations: HashMap<u64, (String, StationMeasurements)> =
+                let mut t_stations: HashMap<u64, (&[u8], StationMeasurements)> =
                     HashMap::with_capacity_and_hasher(DEFAULT_HASHMAP_LENGTH, hasher);
                 for line in mmap_slice.split(|&byte| byte == b'\n') {
                     if line.is_empty() {
@@ -51,7 +52,6 @@ pub fn run() {
                     }
                     let (station, temp) = line.rsplit_once(|&byte| byte == b';').unwrap();
                     let hash = hash::bytes(station);
-                    let station = unsafe { std::str::from_utf8_unchecked(station) };
                     let temp = parse::temp(temp);
                     let measurements_option = t_stations.get_mut(&hash);
                     if let Some((_, measurements)) = measurements_option {
@@ -63,7 +63,7 @@ pub fn run() {
                             count: 1,
                             sum: temp,
                         };
-                        t_stations.insert(hash, (station.to_string(), measurements));
+                        t_stations.insert(hash, (station, measurements));
                     }
                 }
                 let _ = tx.send(t_stations);
@@ -76,13 +76,14 @@ pub fn run() {
                 if let Some((_, joined_measurements)) = joined_measurements_options {
                     joined_measurements.merge(measurements);
                 } else {
-                    stations.insert(*hash, (station.to_owned(), *measurements));
+                    stations.insert(*hash, (station, *measurements));
                 }
             }
         }
         let mut stations: Vec<String> = stations
             .iter()
             .map(|(_, (station, measurements))| {
+                let station = unsafe { std::str::from_utf8_unchecked(station) };
                 let measurements = measurements.to_string();
                 #[cfg(feature = "json")]
                 {