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I'm looking for a simple tool or built-in command that will allow me to measure with millisecond accuracy the time it takes to fetch a remote web page from a given URL.

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up vote 10 down vote accepted

Does this do what you're looking for?

time wget
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Httping will do that.

Httping is like 'ping' but for http-requests. Give it an url, and it'll show you how long it takes to connect, send a request and retrieve the reply (only the headers). Be aware that the transmission across the network also takes time! So it measures the latency of the webserver + network.

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Wireshark will let you examine a transfer in a lot of detail. You can see how long it takes to download a single file, as Dennis suggested, or if you open the URL in a web browser, you can see how long it takes to load all of the related files (images, scripts, etc).

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