You will notice, in these cases, that the sounds do indeed play if the mouse is moved slowly, but begin to drop out when the mouse moves quickly. The sound manager does not get enough interrupts when Virtual memory (VM) is turned on and this causes some sounds to get dropped out of the sound queue.
Users can get improved sound performance when VM is disabled. If you must have user interface sounds and are experiencing problems with lose of sounds, try disabling VM in the Memory Control Panel for an improvement.