W3TC seems to slow down website load times

Hi,

thanks for the plugin.

I am experiencing load time delays in my website https://www.ecoengineer.gr/ that seems to be caused by W3TC.

I had a long conversation and tests with the hosting provider because I thought it is a server problem, but server is working fine. After installing P3 (Plugin Performance Profiler) plugin, it seems that the website delays are coming from W3 Total Cache plugin.

See results in this image: https://www.dropbox.com/s/me72r5z1jfr8lvb/P3%20plugin%20results.jpg?dl=0

Could it be because of a conflict with another plugin or maybe because of some options? Do you suggest something else? Any ideas/recommendations on how to resolve it?

Thank you in advance.