For the record: if you have a sprite with a single animation frame with a bounding box collision mask, it should have identical performance to a tiled background. It will both render and collision test with almost the same code, so one is probably not faster than the other.
The biggest performance difference people come across is using grids of sprites vs. using tiled backgrounds. A single tiled background showing a 10x10 grid of tiles renders as fast as a single sprite. However a 10x10 grid of sprites will render 100 times slower, due to there being 100 sprites. The manual warns about this in Performance Tips