WP Fastest Cache Premium

So, I have premium cache plugin installed on my website.

For whatever reason it delays the site time by about half a second when I activate this plugin. Can you please take a look at it?

http://goo.gl/F16uMa

I will keep plugin active so can take a look at this?

Thanks!

https://ww.wp.xz.cn/plugins/wp-fastest-cache/