diff --git a/internal/cbm/extract_imports.c b/internal/cbm/extract_imports.c
index 9573dad..ae6c67c 100644
--- a/internal/cbm/extract_imports.c
+++ b/internal/cbm/extract_imports.c
@@ -575,9 +575,18 @@ static void parse_lua_imports(CBMExtractCtx *ctx) {
 static void parse_generic_imports(CBMExtractCtx *ctx, const char *node_type) {
     CBMArena *a = ctx->arena;
 
-    uint32_t count = ts_node_child_count(ctx->root);
-    for (uint32_t i = 0; i < count; i++) {
-        TSNode node = ts_node_child(ctx->root, i);
+    /* Use TSTreeCursor for O(1)-per-step sibling traversal.
+     * ts_node_child(root, i) and ts_node_next_sibling() both call
+     * ts_node_child_with_descendant() internally, making naive iteration
+     * O(N²) on roots with thousands of children (e.g. generated .d.ts files).
+     * ts_tree_cursor_goto_next_sibling() maintains cursor state and is O(1). */
+    TSTreeCursor cursor = ts_tree_cursor_new(ctx->root);
+    if (!ts_tree_cursor_goto_first_child(&cursor)) {
+        ts_tree_cursor_delete(&cursor);
+        return;
+    }
+    do {
+        TSNode node = ts_tree_cursor_current_node(&cursor);
         if (strcmp(ts_node_type(node), node_type) != 0) {
             continue;
         }
@@ -616,7 +625,8 @@ static void parse_generic_imports(CBMExtractCtx *ctx, const char *node_type) {
                 }
             }
         }
-    }
+    } while (ts_tree_cursor_goto_next_sibling(&cursor));
+    ts_tree_cursor_delete(&cursor);
 }
 
 // --- Wolfram imports ---