On Solid Edge Options menu select the View tab.
Then on Application Display I would first try automatic.
If thats no good go for Graphics Card basic or backing Store.
Also turn off as many settings as you can - View Transition (if you can do without it), Process Hidden Edges During View Operations and Shading On Selection (this one really can speed things up).
I also set the Culling Slider to mid-way or just higher.
In Assembly, on the Solid Edge Options menu Assembly tab you can also try setting some of the Fast Locate options to on.
bc.
2.4GHz Core2 Quad, 4GB RAM,
Quadro FX4600.
Where would we be without sat-nav?