I am currently starting up a large project with approx 20 HMI's/PLC's. In particularly, WonderWare and SLC 5/05's and suffering some slow downs. We are using switches and unshielded CAT5 cable (as advised) and can not seem to find the route cause. Is it worth getting somesort of network analizer, if so which? Or is it best to contact a company to come in and test it for me? I have followed the guidelines as closely as possible but am now scratching my head as to which way to turn for help. Anybody out there with some advice would be greatly recieved.