Cleanup / optimizations

include/utils/utils.h

@@ -6,18 +6,19 @@
 template <typename T> struct Queue {
   void push(T val) {
     std::lock_guard<std::mutex> lock(m);
-    q.push(val);
+    q.push(std::move(val));
   }
   std::optional<T> front() {
+    std::lock_guard<std::mutex> lock(m);
     if (q.empty())
       return std::nullopt;
-    return q.front();
+    return std::move(q.front());
   }
   bool pop(T &val) {
     std::lock_guard<std::mutex> lock(m);
     if (q.empty())
       return false;
-    val = q.front();
+    val = std::move(q.front());
     q.pop();
     return true;
   }