diff --git a/CHANGELOG.md b/CHANGELOG.md
index db5220cf..7d22e4b7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Changed
+
+- Improve timestamp algorithme. O(n \* m) to O(n)
+
+## [26.08]
+
 ## [26.05.1]
 
 ### Fixed
diff --git a/app/src/main/rust/Cargo.toml b/app/src/main/rust/Cargo.toml
index e04a2ee6..0b187f5f 100644
--- a/app/src/main/rust/Cargo.toml
+++ b/app/src/main/rust/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [lib]
-crate-type = ["cdylib"]
+crate-type = ["rlib", "cdylib"]
 
 [dependencies]
 git2 = { version = "0.21", features = [
diff --git a/app/src/main/rust/RUST_VERSION b/app/src/main/rust/RUST_VERSION
index 6506fb3d..0c818f53 100644
--- a/app/src/main/rust/RUST_VERSION
+++ b/app/src/main/rust/RUST_VERSION
@@ -1 +1 @@
-1.91.1
\ No newline at end of file
+1.97.1
\ No newline at end of file
diff --git a/app/src/main/rust/src/lib.rs b/app/src/main/rust/src/lib.rs
index f4d79cce..5522d2ee 100644
--- a/app/src/main/rust/src/lib.rs
+++ b/app/src/main/rust/src/lib.rs
@@ -26,7 +26,14 @@ const OK: jint = 0;
 
 #[derive(Debug)]
 enum Error {
-    Git2 { error: git2::Error, msg: String },
+    Git2 {
+        error: git2::Error,
+        msg: String,
+    },
+    Jni {
+        error: jni::errors::Error,
+        msg: String,
+    },
 }
 
 impl From<git2::Error> for Error {
@@ -35,6 +42,12 @@ impl From<git2::Error> for Error {
     }
 }
 
+impl From<jni::errors::Error> for Error {
+    fn from(value: jni::errors::Error) -> Self {
+        Self::jni(value, "")
+    }
+}
+
 impl Error {
     fn git2(error: git2::Error, msg: &str) -> Self {
         Self::Git2 {
@@ -43,12 +56,23 @@ impl Error {
         }
     }
 
+    fn jni(error: jni::errors::Error, msg: &str) -> Self {
+        Self::Jni {
+            error,
+            msg: msg.into(),
+        }
+    }
+
     fn add_message(self, msg1: &str) -> Self {
         match self {
             Error::Git2 { error, msg } => Error::Git2 {
                 error,
                 msg: format!("{}: {}", msg1, msg),
             },
+            Error::Jni { error, msg } => Error::Jni {
+                error,
+                msg: format!("{}: {}", msg1, msg),
+            },
         }
     }
 }
@@ -57,6 +81,7 @@ impl From<Error> for jint {
     fn from(value: Error) -> Self {
         match value {
             Error::Git2 { error, .. } => error.raw_code(),
+            Error::Jni { .. } => -1,
         }
     }
 }
@@ -64,9 +89,8 @@ impl From<Error> for jint {
 impl Display for Error {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            Error::Git2 { error, msg } => {
-                write!(f, "{msg}: {error}")
-            }
+            Error::Git2 { error, msg } => write!(f, "{msg}: {error}"),
+            Error::Jni { error, msg } => write!(f, "{msg}: {error}"),
         }
     }
 }
@@ -513,54 +537,44 @@ fn get_timestamps_lib<'local>(
     _class: JClass<'local>,
     j_map: JObject<'local>,
 ) -> Result<jint, jni::errors::Error> {
-    let timestamps = unwrap_or_log!(libgit2::get_timestamps(), "get_timestamps");
-
-    if let Err(e) = get_timestamps_jni(env, &j_map, timestamps.iter()) {
-        error!("get_timestamps_jni: {e}");
-        return Ok(-1);
-    }
-
-    Ok(OK)
-}
-
-fn get_timestamps_jni<'local, 'a>(
-    env: &mut Env<'local>,
-    j_map: &JObject<'local>,
-    timestamps: impl Iterator<Item = (&'a String, &'a i64)>,
-) -> Result<(), Box<dyn std::error::Error>> {
-    let map_class = env.get_object_class(j_map)?;
+    let map_class = env.get_object_class(&j_map)?;
     let put_method = env.get_method_id(
         map_class,
-        jni_str!("put"),
+        jni_str!("putIfAbsent"),
         jni_sig!((JObject, JObject) -> JObject),
     )?;
 
     let long_class = env.find_class(jni_str!("java/lang/Long"))?;
     let long_ctor = env.get_method_id(&long_class, jni_str!("<init>"), jni_sig!((jlong)))?;
 
-    for (path, timestamp) in timestamps {
-        let j_key: JString = env.new_string(path)?;
-
-        unsafe {
-            let j_value = env.new_object_unchecked(
-                &long_class,
-                long_ctor,
-                &[JValue::Long(*timestamp).as_jni()],
-            )?;
-
-            env.call_method_unchecked(
-                j_map,
-                put_method,
-                jni::signature::ReturnType::Object,
-                &[
-                    JValue::Object(&JObject::from(j_key)).as_jni(),
-                    JValue::Object(&j_value).as_jni(),
-                ],
-            )?;
-        }
-    }
+    unwrap_or_log!(
+        libgit2::get_timestamps(|path, timestamp| {
+            let j_key: JString = env.new_string(path)?;
+
+            unsafe {
+                let j_value = env.new_object_unchecked(
+                    &long_class,
+                    long_ctor,
+                    &[JValue::Long(timestamp).as_jni()],
+                )?;
+
+                env.call_method_unchecked(
+                    &j_map,
+                    put_method,
+                    jni::signature::ReturnType::Object,
+                    &[
+                        JValue::Object(&JObject::from(j_key)).as_jni(),
+                        JValue::Object(&j_value).as_jni(),
+                    ],
+                )?;
+            }
 
-    Ok(())
+            Ok(())
+        }),
+        "get_timestamps"
+    );
+
+    Ok(OK)
 }
 
 fn generate_ssh_keys_lib<'local>(
diff --git a/app/src/main/rust/src/libgit2/mod.rs b/app/src/main/rust/src/libgit2/mod.rs
index e56c97e3..3a06e1fa 100644
--- a/app/src/main/rust/src/libgit2/mod.rs
+++ b/app/src/main/rust/src/libgit2/mod.rs
@@ -1,5 +1,4 @@
 use std::{
-    collections::HashMap,
     fs,
     path::Path,
     str::FromStr,
@@ -8,13 +7,12 @@ use std::{
 
 use git2::{
     CertificateCheckStatus, FetchOptions, IndexAddOption, Progress, PushOptions, RemoteCallbacks,
-    Repository, Signature, StatusOptions, TreeWalkMode, TreeWalkResult,
+    Repository, Signature, StatusOptions,
 };
 
 use crate::{Cred, Error, GitAuthor, callback::ProgressCB, mime_types::is_extension_supported};
 
 mod merge;
-
 #[cfg(test)]
 mod test;
 #[cfg(test)]
@@ -376,77 +374,52 @@ pub fn is_change() -> Result<bool, Error> {
     Ok(count > 0)
 }
 
-fn find_timestamp(repo: &Repository, file_path: String) -> anyhow::Result<Option<(String, i64)>> {
-    // Use revwalk to find the last commit that touched this path
+pub fn get_timestamps(
+    mut insert: impl FnMut(&str, i64) -> Result<(), jni::errors::Error>,
+) -> Result<(), Error> {
+    let repo = REPO.lock().expect("repo lock");
+    let repo = repo.as_ref().expect("repo");
+
     let mut revwalk = repo.revwalk()?;
     revwalk.push_head()?;
     revwalk.set_sorting(git2::Sort::TIME)?;
 
-    for oid_result in revwalk {
-        let oid = oid_result?;
+    for oid in revwalk {
+        let oid = oid?;
         let commit = repo.find_commit(oid)?;
 
-        // Check if this commit touches the file
-        if commit
-            .tree()?
-            .get_path(std::path::Path::new(&file_path))
-            .is_ok()
-        {
-            // We want to check if this commit modified the file_path compared to its parent(s)
-            let parent = commit.parents().next();
-
-            let is_modified = match parent {
-                Some(parent) => {
-                    // Compare trees between commit and its first parent
-                    let parent_tree = parent.tree()?;
-                    let current_tree = commit.tree()?;
-
-                    let diff = repo.diff_tree_to_tree(
-                        Some(&parent_tree),
-                        Some(&current_tree),
-                        Some(git2::DiffOptions::new().pathspec(&file_path)),
-                    )?;
-
-                    diff.deltas().len() > 0
-                }
-                // Initial commit, consider as modified
-                None => true,
-            };
-
-            if is_modified {
-                return Ok(Some((file_path, commit.time().seconds() * 1000)));
-            }
-        }
-    }
-    Ok(None)
-}
+        let current_tree = commit.tree()?;
 
-pub fn get_timestamps() -> Result<HashMap<String, i64>, Error> {
-    let repo = REPO.lock().expect("repo lock");
-    let repo = repo.as_ref().expect("repo");
-
-    // Get HEAD commit
-    let head = repo.head()?.peel_to_commit()?;
-
-    let mut file_timestamps = HashMap::new();
-
-    // Get the list of files in the repo at HEAD
-    let tree = head.tree()?;
+        let parent_tree = if commit.parent_count() > 0 {
+            Some(commit.parent(0)?.tree()?)
+        } else {
+            None
+        };
 
-    tree.walk(TreeWalkMode::PreOrder, |root, entry| {
-        if entry.kind() == Some(git2::ObjectType::Blob)
-            && let Ok(name) = entry.name()
-            && let Some(extension) = Path::new(name).extension()
-            && let Some(extension) = extension.to_str()
-            && is_extension_supported(extension)
-        {
-            let path = format!("{root}{name}");
-            if let Ok(Some((path, time))) = find_timestamp(repo, path) {
-                file_timestamps.insert(path, time);
-            }
+        let mut opts = git2::DiffOptions::new();
+
+        let diff =
+            repo.diff_tree_to_tree(parent_tree.as_ref(), Some(&current_tree), Some(&mut opts))?;
+
+        for delta in diff.deltas() {
+            let path = delta.new_file().path().or_else(|| delta.old_file().path());
+
+            if let Some(path) = path
+                && is_extension_supported(
+                    Path::new(&path)
+                        .extension()
+                        .and_then(|e| e.to_str())
+                        .unwrap_or(""),
+                ) {
+                    match path.as_os_str().to_str() {
+                        Some(path) => insert(path, commit.time().seconds() * 1000)?,
+                        None => {
+                            warn!("path can't be converted to str");
+                        }
+                    }
+                }
         }
-        TreeWalkResult::Ok
-    })?;
+    }
 
-    Ok(file_timestamps)
+    Ok(())
 }
diff --git a/app/src/main/rust/src/libgit2/test.rs b/app/src/main/rust/src/libgit2/test.rs
index c280560d..578b8e50 100644
--- a/app/src/main/rust/src/libgit2/test.rs
+++ b/app/src/main/rust/src/libgit2/test.rs
@@ -1,3 +1,5 @@
+use std::{collections::HashMap, time::Instant};
+
 use super::*;
 
 #[test]
@@ -5,21 +7,44 @@ use super::*;
 fn timestamp() {
     open_repo("../../../../../repo_test").unwrap();
 
-    let res = get_timestamps();
+    let mut timestamps = HashMap::new();
 
-    dbg!(&res);
+    let now = Instant::now();
+
+    get_timestamps(|path, time| {
+        timestamps.insert(path.to_string(), time);
+        Ok(())
+    })
+    .unwrap();
+
+    let elapsed = now.elapsed();
+
+    println!("{elapsed:?}");
 }
 
+// cargo test timestamp2 --release -- --nocapture --ignored
 #[test]
 #[ignore = "local repo"]
 fn timestamp2() {
     open_repo("../../../../../note-pv").unwrap();
 
-    let res = get_timestamps();
+    let mut timestamps = HashMap::new();
+    let now = Instant::now();
 
-    let mut res = res.unwrap().into_iter().collect::<Vec<_>>();
+    get_timestamps(|path, time| {
+        timestamps.entry(path.to_string()).or_insert(time);
+
+        Ok(())
+    })
+    .unwrap();
+
+    let mut res = timestamps.into_iter().collect::<Vec<_>>();
 
     res.sort_by(|a, b| a.1.cmp(&b.1));
 
     dbg!(&res);
+
+    let elapsed = now.elapsed();
+
+    println!("{elapsed:?}");
 }