Users on my lan are complaining that there when they click onto ie for the first time it takes a very long time for the homepage to appear. We have a DSL connection to the internet and a vigor router connected to a sonicwall. It seems as if takes time to recognise the inital web site for example at the bottom right of ie it says web site found but then takes a good few to display. We run our own windows 2003 AD with internal DNS with forwarders pointing to our DSL provider DNS servers.
What could be wrong or how would i go about finding out what is making the internet for users so slow.