I also get this problem on a fresh install of Magento 220.127.116.11 with or without sample data. The front end seems responsive but the back end is slow. It seems like the back end waits for a time-out to occur (around 45 sec) after clicking a link, and then serves the new page. There is no processing happening in the mean time.
My test installation is Ubuntu server 9.04 on VMware.
Does that also happen directly after you log in?
In this case:
Magento makes some outbound calls in the admin (at least for getting the admin notifications, maybe other stuff as well) and can apparently be sometimes very slow if these calls are not successful. For testing try to disable the admin notification - go to the file \app\code\core\Mage\AdminNotification\Model\Observer.php and comment out the line
Also make sure that your cache directory is writeable.
Thanks, I’ve tried your solution but it did not help with the delay. When I finally gave the VM internet access, the problem has gone away. There is probably more functions that tries to access the internet apart from that one.
You may try to speed up Magento Backend by implementing the extension Catalog Database Accelerator in case if saving the products in the backend takes you too much time. The system needs to make re-indexing of the entire site each time you change the catalog and it makes to work Magento backend extremely slow. With this module a user does not have to manually index the site, to sit and wait - the system itself does the re-indexing in the background mode.