firestoreの読み取り回数を削減したい

// import 略

const Show = () => {
// id
  const pathname = usePathname();
  const segments = pathname.split("/");
  const id = segments[segments.length - 1];
  // State
  const [todos, setTodos] = useState([]);
  const [comments, setComments] = useState([]);
  const { isOpen, onOpen, onClose } = useDisclosure();

  // Todoリスト
  const postsCol = collection(db, "posts");
  const queryRef = query(postsCol, where("Id", "==", id));
  (async () => {
    try {
      const querySnapshot = await getDocs(queryRef);
      const todoDocObj = querySnapshot.docs[0];
      if (todoDocObj) {
        const data = todoDocObj.data();
        const formattedCreate = format(data.Create.toDate(), "yyyy-MM-dd HH:mm");
        const formattedUpdate = format(data.Update.toDate(), "yyyy-MM-dd HH:mm");
        setTodos({
          Create: formattedCreate,
          Detail: data.Detail,
          Task: data.Task,
          Update: formattedUpdate,
        });
      }
    } catch (error) {
      // console.log(error);
    }
  })();

  // コメント表示
  const fetchComment = async () => {
    try {
      const cmtCol = collection(db, "comments");
      const cmtQueryRef = query(cmtCol, where("Id", "==", id), orderBy("commentCreate", "desc"));
      getDocs(cmtQueryRef).then((cmtSnapShot) => {
        const cmtObj = cmtSnapShot.docs.map((doc) => {
          return {
            commentName: doc.data().commentName,
            commentDetail: doc.data().commentDetail,
            commentCreate: format(doc.data().commentCreate.toDate(), "yyyy-MM-dd HH:mm"),
          };
        });
        setComments(cmtObj);
      });
    } catch (error) {
      console.log(error);
    }
  };
  useEffect(() => {
    fetchComment();
  }, []);

  // コメント追加
  const addComment = async (e) => {
    e.preventDefault();
    try {
      const { commentName, commentDetail } = e.target.elements;
      const newComment = doc(collection(db, "comments"));
      const comdetail = commentDetail.value;
      const comname = commentName.value;
      await setDoc(newComment, {
        Id: id,
        commentCreate: Timestamp.now(),
        commentDetail: comdetail,
        commentId: newComment.id,
        commentName: comname,
      });
      e.target.reset();
      onClose();
      fetchComment();
    } catch (error) {
      // console.log(error);
    }
  };

return(<>略</>)
}