I use a HDMI connection to my monitor with speakers. When playing a score in Musescore the sound is delayed by about 1 second compared to the the activity on the screen. The note in the score which is played is highlighted. When changing the sound device in the tab "I/O" in Musescore from PulseAudio to ALSA audio, sound and picture are in sync. This suggests that pulseaudio is delaying the sound. "I/O" is reached by selecting Edit->Preferences... I noticed earlier also this type of delay when playing a video in Firefox, however currently this is no longer the case. It was most apparent when a person is speaking in the video. Previously I did not use HDMI to produce sound, but an old fashioned sound device, which AFAIR also went through PulseAudio, but I did not see/hear this delay.
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