I have a video in a Nectar slider (the third slide) on my home page but the video takes almost 15 seconds before it starts to play. It's 6Mb and in both a webm and mp4 format. 

Can you tell me why it look like it needs to download before it starts playing?

Here is the URL to the webm version.

http://www.renchurchoh.com/wp-content/uploads/2014...

Thanks in advance!