There may have been some changes to your server by your host.
When you install Etano, the script tries to detect which FILEOP_MODE your server uses or allows, there's 2 possibilities, FTP
If you have a lot members FTP mode isn't recommended as it's slower than DISK mode and might time out when regenerating a large cache, which could be the cause of the slow load times you're experiencing.
You check what mode you're using by looking in your includes/defines.inc.php
If it's in DISK
the following lines will look like this:define('_FILEOP_MODE_','disk');
If it's in FTP
the following lines will look like this:define('_FILEOP_MODE_','ftp');
In FTP mode the 4 last lines will likely have other info such as user and pass info added. In DISK mode the extra lines are left blank as shown in the first example.
If it's in FTP mode, changing the above lines of code so it's in disk mode could effect some files permissions and not work properly until you change the file permissions.
Here's a few topics that have some info regarding this:http://forum.datemill.com/index.php?topic=1948.0http://forum.datemill.com/index.php?topic=1876.0
You may have to contact your host regarding the mode your server uses and what the permissions should be, or possibly they can alter the permissions.