DS Designer is a client-server tool with numerous roundtrips to the underlying repositor database both at start-up and during design operations. It doesn’t work properly in a WAN environment due to network latency. That’s why always recommend the instalation of a WTS or similar, located in the same network segment as the DS server. You will work much faster through a Remode Desktop Connection and will save time and effort in client installs and upgrades.
* We should stop anti virus running on the machine.