Scrolling in large document with Index pane open slow

Submitted by Ross Lagerwall

Link to original bug (#735221)

Description

I noticed recently that scrolling in a large PDF with the Index pane open causes about a ~2 second pause every time the page changes. This is, of course, rather annoying.

How to reproduce:

1. Open the following PDF: http://www.intel.com/content/dam/www/public/us/en/documents/manuals/64-ia-32-architectures-software-developer-manual-325462.pdf https://github.com/wuzhouhui/misc/raw/master/64-ia-32-architectures-software-developer-manual-325462.pdf
2. Ensure that the Index pane is open.
3. Scroll between pages.

This is with Fedora 20, Gnome Shell and Evince 3.12.1 on newish hardware with an AMD GPU.

Thanks!

Version: 3.12.x