Struggling with 1080p playback on iPad

Using iPad Air 2 – and the Infuse 5.3 with its rebuilt playback core – 1080p x264 MP4 video does stutter when starting its playback, scrubbing to a particular point or RW/FF using the appropriate buttons. Why is this?

If you have a chance, please send in an email from your device so we can look into this.