smooth 360 video playing

Hi

I have prepared the 360 video from stil panorama: http://3dpiso.es/sola/video.webm
It is just 2k, 4 seconds, 30fps, 1,3MB

But when I am trying to play it in krpano, the result is not smooth at all: http://3dpiso.es/sola/ (desktop, S7, ...)

I implement a vide like this:

<plugin name="video"
url.flash="videoplayer.swf"
url.html5="videoplayer.js"
videourl="video.webm"
loop="true"
/>

<!-- the intro pano image -->
<view fovtype="VFOV" fov="90" fovmin="40" fovmax="150" />
<preview url="panos/intro/preview.jpg" />
<image>
<sphere url="plugin:video" />
</image>

Am I missing some quality settings? What should I do to achieve the smooth video playing?

Thank You.