Right now, it can take several seconds to display images in the Media Viewer, because we're asking the server to resize the image at a custom size.
To speed up this image display, we will try to fetch the thumbnail size that is closest to 100% of the screen width but no more than 90% of the screen height (instead of asking the server to pre-render custom sizes, which is too time-consuming).
We would also start displaying the image as soon as it is available, without waiting for the meta-data to be loaded.
Version: unspecified
Severity: major
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=64135