Problems with shared folder in IIS6 on windows server 2003

Question

Hello,

We have 3 IIS servers that. We have another file server (windows server 2003 too). The three IIS server have IMAGE folder that point with UNC to the file server.

We show the images to the users with transmitFile in ASP.NET. every thing is working great but in the press hours we have every one minute delays.

We change a lot of reg config and check them all. also we updates the network driver.

Does any one have what can we do to solve this or in what tool we can use to find the problem.

Thanks, Noam