When the 'startsAt' has a value bigger than 0, player always shows the first frame before it loads the frame of 'startsAt'.

This is very simple to reproduce.
I set the 'startAt' value to be 5 or 10 or 37, no matter what, the player shows the first frame of the video for few milliseconds and then loads the frame of targeted frame.

Is it possible to improve?
I'd expect to not to load the first frame at all until the targeted frame shows up.

Thank you for your time in advance,
John