TeX-TikZ-slow-MWE.tex

\documentclass[]{article}

\usepackage{pgfplots}
\usepackage{graphicx} 

% Comment out the next three lines for faster compilation time
\usepgfplotslibrary{external}
\tikzexternalize
\tikzsetexternalprefix{figtemp/}

\begin{document}
   	
   	\section{First}
   	\begin{tikzpicture}
   	\tikz \draw[thick,rounded corners=8pt]
   	(0,0) -- (0,2) -- (1,3.25) -- (2,2) -- (2,0) -- (0,2) -- (2,2) -- (0,0) -- (2,0);
   	\end{tikzpicture}
   	
   	\section{Second}
   	\begin{tikzpicture}
   	\draw (-1.5,0) -- (1.5,0);
   	\draw (0,-1.5) -- (0,1.5);
   	\end{tikzpicture}
   	
   	\section{Third}
   	\begin{tikzpicture}
   	\draw (0,0) arc (0:315:1.75cm and 1cm);
   	\end{tikzpicture}
   	
\end{document}