After switching from Emacs 26 to 27 (from backport) the start of Emacs takes
several emacs on accounts with NFS home directory.

Running it with strace shows the reason [strace -f -v  emacs -q --no-site-
file]:
[pid 2756642] openat(AT_FDCWD, "/usr/lib/X11/app-defaults/Emacs", O_RDONLY) =
-1 ENOENT (Datei oder Verzeichnis nicht gefunden)
[pid 2756642] openat(AT_FDCWD, "/c42home/dirkde_DE.UTF-8/Emacs", O_RDONLY

- /c42home/dirk is the NFS home directory for user dirk
- /c42home/… is automounted
- The missing slash result in a non-existent mapping
- The startup is blocked till autofs runs in the timeout.

Beneath the long startup the intended resource could not be retrieved.