I'm keen to think that TTFB in his case is due to buffering (or an inbetween proxy). Overexxagerating, either the user takes 4 seconds to download the full page (which is transmitted as soon as the webserver outputs something) or he takes 2 seconds waiting for the webserver to buffer (TTFB) and 2 seconds to download "at full speed" the content (cause it's buffered yet). User will have the page after 4 seconds, no matter what.
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