Instead of loading everywhere.
|Duplicate||Jhernandez||T104432 [EPIC]: Improve mobile site performance|
|Resolved||Jdlrobson||T98986 [EPIC] Improve the status quo of mobile web performance|
|Declined||None||T100255 [EPIC] Load ResourceLoader startup module from the bottom of the HTML|
|Resolved||Jdlrobson||T100378 ext.imageMetrics.head should only load on File pages|
It's collecting image loading times for the big images on file pages, and information about CORS support. The latter needed to be done on mobile as well, but we probably already collected enough data so I'll disable it once I have the time to go through the data and verify it is valid. If you feel the image loading times are not useful on mobile, I can disable that as well. (Mind you, the file is ~200B minified+gzipped, so removing it would change the size of the head scripts by about 0.2%.)