My components are very slow

My components are very slow. I have almost 200 users only. I have to optimize. What I have to do to make this did not pass. I use a shared server (hosting profesional):

https://dinahosting.com/hosting

I have Joomla cache enabled and plugin cache Joomla.

This web This blog gives me errors:

http://developers.google.com/speed/pagespeed/insights/?url=policiasnacionales.es&tab=desktop

You can help me understand and solve this better

Thank's