https://bugzilla.wikimedia.org/show_bug.cgi?id=70790

            Bug ID: 70790
           Summary: Performance/architecture review of ImageMetrics
           Product: Wikimedia
           Version: wmf-deployment
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Extension setup
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: gti...@wikimedia.org
                CC: dereck...@espace-win.org
            Blocks: 70402
       Web browser: ---
   Mobile Platform: ---

[[mw:Extension:ImageMetrics]] will be used to collect additional data about
image performance and (eventually - not implemented yet) about how users
interact with media.

The extension has a similar architecture to NavigationTiming, except it
lazy-loads the main script. Currently it consists of a ~300 byte top script
which sets up pre-domready event handling, a ¬300-byte bottom script which
deals with request sampling, and a ~2K main script which is lazy-loaded when
the request is sampled and uses EventLogging to log image load performance
data. Currently the scripts are only loaded on file pages, but I intend to
change that as more functionality is added.

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