diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 0000000..d89a9a6
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,5 @@
+## 2025-05-18 - Batch git branch deletion in PowerShell
+
+**Learning:** Invoking `git branch -D` individually inside a `ForEach-Object` loop introduces significant process spawning overhead (N+1 CLI invocations). Passing an array of branch names directly to a single `git branch -D` command allows PowerShell to expand arguments and execute deletion in a single process invocation.
+
+**Action:** Whenever performing bulk operations with native CLI executables in PowerShell (e.g., git branch, git rm), collect target names into an array and pass them in a single command invocation rather than iterating over items in a loop.
diff --git a/script.ps1 b/script.ps1
index d9ae342..66d70fc 100644
--- a/script.ps1
+++ b/script.ps1
@@ -173,11 +173,9 @@ foreach ($pr in $prs) {
 
 # --- Nettoyage des branches locales restantes ------------------------------------
 if (-not $DryRun) {
-    git branch | ForEach-Object {
-        $branchName = $_.Trim("* ").Trim()
-        if ($branchName -and $branchName -ne $BaseBranch) {
-            git branch -D $branchName 2>&1 | Out-Null
-        }
+    $branchesToDelete = @(git branch | ForEach-Object { $_.Trim("* ").Trim() } | Where-Object { $_ -and $_ -ne $BaseBranch })
+    if ($branchesToDelete.Count -gt 0) {
+        git branch -D $branchesToDelete 2>&1 | Out-Null
     }
 }