\documentclass{article}
\usepackage{tikz}

% set up externalization
\usetikzlibrary{external}
\tikzset{external/system call={latex \tikzexternalcheckshellescape -halt-on-error
-interaction=batchmode -jobname "\image" "\texsource" &&
dvips -o "\image".ps "\image".dvi &&
ps2eps "\image.ps"}}
\tikzexternalize

\begin{document}
\begin{tikzpicture}
\draw (0,0) circle (1cm);
\end{tikzpicture}
\end{document}