You can specify the quality a Flash movie will be played at: Low, Medium or High. The advantage of low quality mode is that it reduces CPU load and playback becomes very smooth. On the other hand, it essentially decreases movie quality.
The specified value will be applied just on the go, if a Flash movie is currently played. Also, this value will be selected automatically each time any Flash movie is played.
This option is available from Main menu –> Preferences.