Movie Texture problems (frame drops, lag, slow)

I had this problem with mp4 files and solved it by changing to ogv files.

I had the same problem and fixed it by setting QualitySettings.vSyncCount to Don't Sync.

e.g.

 public MovieTexture myMovie;
 int vsyncprevious;
 
 void Start ()
 {
    vsyncprevious = QualitySettings.vSyncCount;
    QualitySettings.vSyncCount = 0;
    myMovie.Play();
 }
 
 void Update()
 {
    if (!myMovie.isPlaying())
    {
      QualitySettings.vSyncCount = vsyncprevious;
    }
 }

This is an old problem and I don't think there's a real solution. As silly as it sounds, changing the texture frame by frame is actually faster:

http://bernieroehl.com/360stereoinunity/

Use format .MOV in your movie