Speed of Product page load

My Product use old version Marketpress: 2.9

The products pages take close to 10 seconds to load, there is not a whole lot of content on the page, please investigate why this is taking so long.

http://screencast.com/t/GMZvrlpYe2

I have updated with new version Marketpress, but my site has many issues, many pages not working

Ex-link: https://dev.videomantis.com/store/products/bell-light-systems

Please give for me some resolution to improve speed page load

Please response here.

Thanks