Stuttering/Lag with Video Player on play but returns normal halfway through

Hi,
I can’t figure out why this is happening. The video player is fine in the editor but in a build, the video player will stutter on play until half way through then it plays fine. Is there something I need to be doing with the video/videoplayer?
Video :
60 fps
1920 x 1080
H264 mp4

Video Player:
Wait for first frame

Kind Regards

Hello @autumn_737 , please submit a bug report so we can investigate this further - you can find the process on how to do so detailed here: Unity QA: Building quality with passion