Use static hourglass image instead of an animages GIF during image loading, remove usage of scrollstop, start generating previews much sooner (threshold of 400 pixels), remove fallback code when javascript is disabled, show pages previews as a vertical scroller seems to reduce lag and browser memory consumption.
Split document view into document preview, document content and document properties views
Remove the MULTIPAGE_PREVIEW_SIZE configuration settings, clicking on a page preview now redirects to the page detail view, added post lazy load class support, use post lazy load class support to add 100% width to document page previews