My team is doing some tests to see if the image loading will be faster with the Cloudflare Image Resizing in China and South East Asia. After a few tests, the images are taking about 200ms due to longer TTFB in both test locations, China and the Philippines.
From the initial test, we have identified Philippines requests are getting returns from the HKG data centre, while China is getting returns from the LAX data centre.
I wonder why China is not getting data from the HKG server, which is the nearest outside China, while the Philippines should be using the data centre from Manila or Cebu.
Is there a way to validate this further or improve the TTFB of the image resizing? Is the image resizing only limited to some data centres?