How to get the video to play in high quality from the start?

I have set my default video quality to 1440p. All videos automatically switch to that quality (or 1080p, if 1440p is not available). The problem is though, that it happens after 5/6 seconds of that video being played in low quality (360p or 480p). Rewinding it doesn't help. How do I get high quality streaming from the get go?