diff --git a/codegraph-kernel/src/resolve/mod.rs b/codegraph-kernel/src/resolve/mod.rs
index 2df678837..ad22ab441 100644
--- a/codegraph-kernel/src/resolve/mod.rs
+++ b/codegraph-kernel/src/resolve/mod.rs
@@ -783,6 +783,9 @@ pub struct KernelResolver {
     /// is_generated_file per path — the >256-pool scans run its ~25
     /// regexes once per candidate; pools share few unique paths.
     gen_path_memo: HashMap<String, bool>,
+    /// local_declaration_scope, by candidate id — its own map so the key
+    /// needs no "local:"-prefixed format! alloc.
+    local_decl_scope_memo: HashMap<String, Option<(i64, i64)>>,
     language_type_scope_memo: HashMap<String, Rc<language_type_scope::LanguageTypeScope>>,
     scala_package_object_membership_memo: HashMap<String, Option<(String, i64, i64)>>,
     cpp_default_declaration_memo: HashMap<String, declarations_upstream::CppDefaultDeclarationIndex>,
@@ -996,6 +999,7 @@ impl KernelResolver {
             bare_name_memo: None,
             bare_receiver_memo: HashMap::new(),
             gen_path_memo: HashMap::new(),
+            local_decl_scope_memo: HashMap::new(),
             language_type_scope_memo: HashMap::new(),
             scala_package_object_membership_memo: HashMap::new(),
             cpp_default_declaration_memo: HashMap::new(),
diff --git a/codegraph-kernel/src/resolve/resolver_upstream.rs b/codegraph-kernel/src/resolve/resolver_upstream.rs
index ff754c5f5..439cc470d 100644
--- a/codegraph-kernel/src/resolve/resolver_upstream.rs
+++ b/codegraph-kernel/src/resolve/resolver_upstream.rs
@@ -177,8 +177,10 @@ impl KernelResolver {
         {
             return Ok(None);
         }
-        let key = format!("local:{}", n.id);
-        if let Some(hit) = self.lexical_scope_memo.get(&key) {
+        // Own memo keyed on n.id — the shared lexical_scope_memo needed a
+        // "local:"-prefixed format! key (a String alloc per call) only for
+        // namespacing.
+        if let Some(hit) = self.local_decl_scope_memo.get(n.id.as_str()) {
             return Ok(*hit);
         }
         let scope = self
@@ -194,7 +196,7 @@ impl KernelResolver {
             })
             .min_by_key(|f| f.end_line - f.start_line)
             .map(|f| (f.start_line, f.end_line));
-        self.lexical_scope_memo.insert(key, scope);
+        self.local_decl_scope_memo.insert(n.id.clone(), scope);
         Ok(scope)
     }