"Time to First Byte" speed is very slow [17seconds] - MIIDUU

[lhkjacky]

I have create a few site in miiduu.
However the Time To First Byte (TTFB) of their web page is extremely long, 15~17seconds.
I have reported this problem to their customer service many times, but they still didn't help me solve this problem, What can I do?

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Report from Webpagetest.org
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Request Headers
Request 1:
URL: http://figuremaster.miiduu.com/
Host: figuremaster.miiduu.com
IP: 141.101.126.44
Location: Cloudflare*
Error/Status Code: 200
Initiated By:
Start Offset: 0.292 s
DNS Lookup: 238 ms
Initial Connection: 53 ms
**Time to First Byte: 16797 ms**
Content Download: 117 ms
Bytes In (downloaded): 22.0 KB
Bytes Out (uploaded): 0.4 KB
Request Headers: