Why cloudfront cdn is not faster in chrome-devtool, but faster using network tool like httping

I host static files by aws cloudfront cdn

It is result that get file from server, it took 4.62s.
My location in Taipei, and server in Tokyo.
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And it is from cloudfront cdn, it took 4.97s.
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I try a lot of times, the cdn response always slower than server.

But when I use some track tools like httping
cdn(avg: 159.3ms) is faster than server(313.3ms)

Can somebody tell me why??
I believe the cdn response is faster than server