High TTFB for a website

Hi,

We have hosted our WordPress website using windows server 2012. We are using VPS cloud plan. The link is https://www.efacility.in/demo-wp/. This has high TTFB. This is just a default WP source with total cache plugin and nothing more than that. So the TTFB should not be high.

We checked with WP forum, they said that at the WordPress level apart from configuring cache plugin we cannot do anything else and need to check with hosting support. Ref link: https://wordpress.org/support/topic/high-ttfb/

We checked with our hosting support and they said that there is no issues in hosting server side

Could you please suggest what may be reasons for this

Thanks