the test takes too long time for a very simple page

Hi Everyone.
I’m newbie to webpagetest.
and i’ve setup correctly of a private instance on a windows server.
but First Byte,Start Render take a too long time.

i suspect the issue is at the below two urls.
http://127.0.0.1:8888/blank.html
http://127.0.0.1:8888/blank2.html
on the server side , keeps stay at above two urls for a long time.

Does it because of the server is located in china?
Anybody knows why above two urls been blocked?

i’m using the latest code from below url.
https://github.com/WPO-Foundation/webpagetest/releases/tag/WebPageTest-3.0