Videos Slow on website

Could you advise me on why is the video playback very slow? It starts ok and then it just stalls.

Is there a preferred format I should be uploading my videos as? I have currently uploaded as MP4 format.

Example of one my videos is appended below.

-Shamla Ramasamy 

Hey there!

When uploading videos, you'll want to make sure they meet our formatting requirements, found here: 

Adding videos to your site

Keep in mind that longer videos may need extra time to buffer, depending on your internet connection. 

If you have further questions, get in touch with our Customer Support team any time.