You might notice that Arcade Convoy uses its particle engine throughout the games. The particle engine really helps drive the game. Sometimes it is fun to play with the particle engine. For instance you can make the particles big and last forever in brick buster. But the particles also like to use the computers processing power. If your cpu is struggling then turn down some of these features. If you have plenty of processing power, then you might want to turn them up and really see the particles.