Page loading slowly

Hi there, so I have my site using w3, and its great, but when I do a speedtest on pingdom it shows that a particular item is loading REALLY slowly, see the results here:

http://www.logoglo.com/wp-content/uploads/2016/03/pingdomtest.jpg

Everything else loads really quickly, but this is slowing the site down, any thoughts on how to fix it?

Thanks.

Gary.

https://wordpress.org/plugins/w3-total-cache/