Rails core - Mar 2013 - Getting Turbolinks measurements that include load time for sub-resources

(Originally from https://github.com/steveklabnik/turbolinks_test/issues/4, 
where Steve suggested I post here instead)

Something''s been bugging me with regards to measuring Turbolinks 
performance. I''m interested mainly in the capture of page loading time
via
browser instrumentation ''in the wild'', but I think the issue
applies just
as much to offline measurement.

For a normal page load, the ''load'' event is not fired (from my
understanding) until the top-level resource and all of its critical 
sub-resources are actually loaded (including, for example, images embedded 
in the page body). For a page load via Turbolinks, there doesn''t appear
to
be an equivalent event to hook. The ''page:load'' event emitted
by Turbolinks
is not sufficient for this purpose, because it fires before the critical 
sub-resources of the newly swapped-in body are loaded.

Some experimentation in Chrome suggests that new ''load'' events
are not
fired on window or on the new body element, and I don''t really know
where
else to look. Does anyone have any suggestions as to how to place a finish 
line on Turbolinks testing that''s analagous to the traditional DOM load
event, or other approaches to capture the time needed to load sub-resources 
referenced from the new body?

Thanks!
Ben

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