Im not in a position to get any support from YITH. In fact its not even possible to reach them without buying something from them. I wonder how it is you can recommend users to install MaxCDN and W3TC in your knowledgebase when its not even functional with your theme.
I realize this is not a simple thing to troubleshoot but having seen dozens of developers on here posting their sites – I have not seen one of them that performs at a fast blistering pace that would make anyone believe that a cache plugin is not necessary. Basically I really hope there is some actual plan to get this fixed and Im not just waiting for nothing.