(hopefully) no duplicate of Number of pages decreases when font size increases, because the font size is one of the defaults.
In an attempt to fit more text on a page, I decreased the font size, only to notice that the border size increases.
\documentclass[11pt]{scrartcl}
\begin{document}
\begin{center}
\Huge{Heading}
\end{center}
Text
\end{document}
With [11pt], the output is as follows:

With [10pt], the text is of course smaller, but the border is considerably larger:

Does anyone know how this can be prevented, and why it occurs in the first place?