Vantage 6.1 speed issue

We moved Vantage 6.1 from its own server over to our main server which is much more powerful and should run it well. We only have 12 users. It runs OK with a couple of exceptions. We are a boat manufacturer, and our boat jobs tend to be quite large (several hundred parts). When we create or backflush boat jobs the Vantage software slows to a crawl for all users while the process is running. Does anyone know any tweaks or fixes we could try that might help us out with this?