Linux tool to show progress for cp, rm, dd, ...
This article assumes a KVM guest that runs from raw or qcow2 devices using emulated ide access. Since some time now, full virtualisation for block devices is available, facilitating the benefit of paravirtualisation. Benchmarked in bonnie++, the difference looks like this, revealing a way better performance of virtio:
The Authcache module offers page caching for both anonymous users and logged-in authenticated users. This allows Drupal/PHP to only spend 1-2 milliseconds serving pages, greatly reducing server resources.