Help! Sequencer Lag Once Media Starts Playing?

Hi All,

Why does Sequencer lag the moment my media plate starts playing? The media itself doesn’t lag once it starts playing, there is just a lag for half a second as soon as it begins. And why does the media not turn black after it is done playing in the Sequencer (it remains paused on last frame). This is the final obstacle of my project that I cannot seem to overcome. Thank you in advance for any help/suggestions.

UE5 Lag Sequencer Media