[XeTeX] long search time when font doesn't exist

[Ulrike Fischer]

Hello,

if I try to use a font that doesn't exist (e.g. because I mistype the
name) then xelatex stops for about a minute while the hard drive is
quite busy. Then I get the expected "tfm missing" error. 

What is xelatex doing there? Is this normal or a miktex-related
behaviour? (I couldn't get any information from traces with debugview.)
And more importantly what can I do to shorten the time until I get the
error?

My XeTeX-version:
This is XeTeX, Version 3.1415926-2.2-0.997 (MiKTeX 2.7) (preloaded
format=xelatex 2008.4.9) 

A minimal document is

\documentclass{article}

\font\x="Myriad Proxx"
\begin{document}
\x xx
\end{document}

-- 
Ulrike Fischer