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    > There is no single metric that conveys
    > the user experience (or performance)
True. But if you need to pick one, TTFB isn't as good as something like Speed Index [1]. Getting your TTFB down will usually help you get your content in front of the user faster by, as you say, giving it a head-start on external resources, but that will also show up in the Speed Index.

[1] https://sites.google.com/a/webpagetest.org/docs/using-webpag...

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