diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 00000000..fbd17dd9
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,3 @@
+## 2026-05-14 - [Intermediate Allocations]
+**Learning:** String concatenation using `.collect::<Vec<_>>().join("")` creates unnecessary intermediate allocations compared to `.collect::<String>()`.
+**Action:** Always prefer `.collect::<String>()` for iterator-based string building.
diff --git a/xdk-lib/src/casing.rs b/xdk-lib/src/casing.rs
index 6463487e..8c827624 100644
--- a/xdk-lib/src/casing.rs
+++ b/xdk-lib/src/casing.rs
@@ -29,11 +29,9 @@ impl Casing {
                     result
                 }
             }
-            Casing::Pascal => words
-                .iter()
-                .map(|w| pascal_case(w))
-                .collect::<Vec<_>>()
-                .join(""),
+            // Bolt: optimize string concatenation by directly collecting into a String
+            // to avoid intermediate Vec allocations.
+            Casing::Pascal => words.iter().map(|w| pascal_case(w)).collect::<String>(),
             Casing::Kebab => words.join("-").to_lowercase(),
             Casing::ScreamingSnake => words.join("_").to_uppercase(),
         }