[turba] Turba is very slow

[Linux Corporativo]

Hi everybody,

I´m using:
HORDE 3.1.1 - IMP (H3) 4.1.1 - TURBA (H3) 2.1.1 - PHP 4.3.9-.3.1 -
POSTFIX 2.1.5-2.3.RHEL4.1 - MYSQL 4.1.7-4.RHEL4.1 - MAILDROP 2.0.2

Login, reading/writing messages and all mail related functions works
ok and fast. But when I call Turba from IMP it takes a long time to
open... and every function within Turba delays the same way, more than
5 minutes.

Just once I got an error in my log saying "You need a VFS backend", so
I checked this on the config files and in Horde Admin, it is set do
"localsql" and working, because personal prefs are saved in MySQL ok.

Can anyone help me solve this problem?

Thanks to all.