Mass-removing the Multimedia tag from MediaViewer tasks, as this is now being worked on by the Reading department, not Editing's Multimedia team.
@Tgr: Could this be a potential Google-Code-In-2015 task you (or someone else?) could imagine to mentor?
Sure, although there will be deploy freeze for the next five weeks or so and this involves config changes.
Imported into GCI as https://codein.withgoogle.com/tasks/4714947590225920/
I believe this has already been fixed? $wgMediaViewerNetworkPerformanceSamplingFactor is already used in MultimediaViewerHooks.php