Viewtiful Joe NTSC Choppy intro FMV

[DolphinPC]

The game runs fine, bit I noticed something weird: Although the game easily runs at full speed (if I unlock the fps it easily runs at over 200fps) on all backends, the "Team Viewtiful" part in the intro drops to 24 FPS (but the game still runs at full speed), and the audio becomes choppy (but not like dropping below 100% speed). I overclocked the internal CPU to 160% and then the specific part ran at full screen. I didn't use any non-default settings. While the issue doesn't bother me and the game runs perfect, I just wonder if there is any timing issue that causes this, perhaps the emulated CPU is running too slow without any overclock?