Assuming the reference is to browser flash plug ins and not to
standalone PC flash players the following are the two main ways to
boost flash player speed.
1.Normally Flash player needs good system hardware to play demanding flash resources smoothly. So you should have a good memory ( primary memory or RAM) for faster flash performances. Some browsers are said to have better flash plug in compatibility. Opera, Mozilla and Chrome are one of the best at this.
2.Another factor in flash player speed is the amount of time needed to download the flash file from internet to view it properly. This purely depends on speed of internet connection. So for faster buffering make sure you have a broadband connection. Higher the speed the better the performance.