Regarding Web Page latency.... I would expect web developers to be more slack on these types of definitions as they are so far removed from the hardware. Still, having said that: 
<a href="http:&#x2F;&#x2F;blog.iweb.com&#x2F;en&#x2F;2014&#x2F;02&#x2F;understanding-analyzing-reducing-latency&#x2F;13176.html" rel="nofollow">http:&#x2F;&#x2F;blog.iweb.com&#x2F;en&#x2F;2014&#x2F;02&#x2F;understanding-analyzing-redu...</a><p>This indicates that &#x27;web page&#x27; latency is nothing to do with redraw-duration, but more akin to network-latency, but for the page as a whole. In comparison to redraw-duration (which is entirely client-side, web-page latency is the time to transit the network... i.e. latency.<p>In all the above cases, &#x27;latency&#x27; is the delay between the stimulus and response, <i>not</i> the processing time.<p>I&#x27;ll leave you with <i>the</i> top Google result for &#x27;latency&#x27;:<p>&quot;Latency is a time interval between the stimulation and response, or, from a more general point of view, as a time delay between the cause and the effect of some physical change in the system being observed.&quot;