Frank says that editing his videos is taking forever to render, so he's looking at a new Dell XPS computer. Will it matter? Leo says absolutely. More RAM will also help. A graphics card with a good GPU helps as well. The GPU is always the bottle neck and these days, modern computer software tries to harness the graphics processor to handle all the heavy lifting.
Frank should check out PCPerspectives for the best combination for video editing. The GTX750 is what they recommend.