calculate load time of landing page url when an user clicks on href link in javascript -

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i trying find out load time of landing page url of ad. when user clicks link/ad, goes landing page abc.com. want to
know whether operation finished or time has taken load.
possible in javascript?

my first thought pre-calculate size of resources, , when render client application, instead of having direct urls, have map url , it's size. need connection speed, can calculate when page loads (for instance, take small image, calculate download time , transfer rate).

maybe there's smarter gzip compression, since browsers support it.


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