How to get current page size in KB using just javascript?

Unless your page has size in megabytes, the result will be meaningless.

This is because time needed to connect, send request, and wait for server to send reply back is quite large compared to time required to download the page, and in addition to that TCP/IP has slow start.

You also have to take into account caches, proxies and number of parallel connections that browser will make (e.g. may prioritize download of scripts and styles, making page download time appear slow).

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