There are a number of things that could cause this, From what I can tell, Your Video card seems to be a lower end model ($45 max price via pricewatch.com) Most Solid Model CAD programs require a lot of Video Proccessing power to perform well. Have you checked the Application display mode In Solid Edge? Go to the Tools -> Options and the View Tab The Pop Down list box called "Application Display" The Safest Bet is to use the "Backing Store" option, but you can always try "Graphics card driven" to see what happens. Also what is your screen resolution set to? What Options does your video Card have? OpenGL options that Solid Edge Seems to like are the use of the Unified Back/depth Buffer, also to use "block transfer".
Other causes maybe your system configuration: What is your System Configuration: CPU? RAM? Operating System etc. it could even be something as simple as a program that is running in your task tray, apparently the real audio application that runs in the task tray causes problems with SE, but there are others too. It seems your question raises more questions than answers but hopefully this will give you some clues.