snapshot on a busy disk

Hi,

On a busy fileserver I use snapshots to enable users to restore their files without having to revert
to backup tapes etc. It is being used several times a week so I would rather not disable that
function. However we have the idea that the disks are slower than they should be and someone
suggested it was because of the overhead of the snapshots.

Is there any way to determine wheter the delay is (partly) due to the snapshots?

Bonno Bloksma