Safari comes with a Macromedia Flash player built-in. Unfortunately, it isn’t nearly as fast as Macromedia’s Flash Player 8.
Try this 3 step process with Safari:
1. Find a heavy Flash-based website. Reload it a few times with Safari.
2. Download the new Flash player from the Macromedia site, and install it.
3. Go back to the Flash-based website. See the difference?