Thanks for writing. One note about fast-growing plants --- the quicker a plant grows, the more susceptible it is to attack from pests and diseases, as well as being damaged by weather. Also: In the world of shrubs, evergreen varieties are typically slower growing than deciduous varieties.
That said, you might consider rhododendrons, dwarf hemlocks, or boxwood for a mostly shaded area.
---Justin, Senior Garden Editor, BHG.com