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Checkmate said:
The full png load for me in 4.05s.

Do me a favor, press F12 using chrome or chrominium based, go to network, check the box Disable Cache and press F5 to refresh the full size png. Click on the image files, click on the tab Timing and share me the results of Request Sent/TTFB/Content Download.
Just did a test. US West, Comcast network.

Test file: https://files.yande.re/image/b56d6b81e385e843b193ac42e59a6237/yande.re%20772202%20hakurei_reimu%20tagme%20touhou.png

Result: https://imgur.com/YBxezXV