\begin{frame}
  \frametitle{Challenges of ORMs}
  
  \begin{itemize}
    \item ORMs introduce an additional level of complexity
      \begin{itemize}
        \item can be difficult to debug
      \end{itemize}
    \pause\medskip
    
    \item Performance analysis is problematic because:
      \begin{itemize}
        %\item applications behaviour not tied directly to specific interactions with the database
        \item database queries are under the hood
        \item sometimes \alert{very} complex SQL queries are generated
        \item difficult to understand what caused the complex queries
      \end{itemize}
  \end{itemize}
\end{frame}