\large
\settoheight{\myListItemsep}{.}
\begin{myList}
\item decrease of code size
\item decrease of resource usage 
{\normalsize
\begin{itemize}
\item power
\item memory
\item silicon area
\end{itemize}}
\item increase of performance 
{\normalsize
\begin{itemize}
\item response time
\item throughput
\end{itemize}}
\end{myList}