I solved my performance problem with tex stuff run as non-root, using
top and Google:

In this article ...
http://www.esm.psu.edu/mac-tex/MacOSX-TeX-Digests/2001/MacOSX-TeX_Digest_11-26-01.html
... from 2001 (!) I found:
--- SNIP ---
- Added '$HOME contains //' check to TeXGSInstaller installation script 
(if a directory ends on /, kpathsea can become extremely slow)
--- SNIP ---

Due to certain circumstances (see below) my home directory was set to 
/home/johndoe/./ 
After I removed the trailing /./ (and rebooted), latex and xdvi performed well 
again.

Just in order not be declared crazy, I admit that such home directory settings 
are extremely rare.
Such as:
1. Certain FTP daemons are taking /./ in a user's home dir as chroot-him-there 
hint.
2. When doing domain/mail/web/application hosting (even on our small level with 
some 20 customers) appending /./ to most user's home directory allows to easily 
chroot them for FTP access while still granting more freedom to a few trusted 
users.
3. To guarantee synchronity of uids, group memberships, passwords etc. we 
include most of our internal servers and workstations in the ISP administration 
system we created for ourselfes.

Despite my extremely rare circumstances, adding a protection towards
this problem would definitively be an enhancement after all ;-))

-- 
fancyheadings.sty disappeared
https://bugs.launchpad.net/bugs/132399
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