Reorganize tikz import, see link below

https://tex.stackexchange.com/questions/594665/texlive-hangs-when-using-tikzexternal

laweb.sty

@@ -15,9 +15,7 @@
 
 
 \ProvidesPackage{laweb}[LaWeb Package]
-\usepackage{tikz,graphicx,tikz-dependency}
-\usetikzlibrary{external}
-
+\usepackage{tikzexternal,graphicx,tikz-dependency}
 
 \tikzset{
     png copy/.style={