File with many repeated patterns sortof freezes browser

[THausherr]

Link to PDF file (or attach file here):
https://bugs.ghostscript.com/attachment.cgi?id=7455

Configuration:

• Web browser and its version:
  FF 51.0.1 32bit

• Operating system and its version:
  W7

• PDF.js version:
  https://mozilla.github.io/pdf.js/web/viewer.html

Steps to reproduce the problem:

1. click on link

What is the expected behavior?
that it be displayed

What went wrong?
Only a part is drawn and then firefox freezes / gets very slow, the "wait" animation is there. Sometimes it is possible to close the tab, but FF is still slow, so I close and restart it.

Thoughts about this file (which is a real world file, but kindof extreme):
https://bugs.ghostscript.com/show_bug.cgi?id=692158
https://issues.apache.org/jira/browse/PDFBOX-3688

I also tried with MSIE. It first popped up a scary dialog box about a "32/64bit thumbnail bridge" which I denied. Then the effect was the same than with FF.

[Snuffleupagus]

This particular PDF document is quite slow to render even in Adobe Reader, hence I'm thinking that we can call this issue fixed after the following patches:

• PR Tweak the QueueOptimizer to recognize OPS.paintImageMaskXObject operators as *repeated* when the "skew" transformation matrix elements are non-zero (issue 8078) #12016, which improved overall performance quite a bit.
• PR Fix several issues with radial/axial shadings and tiling patterns. #13361, which made the light-blue pattern visible.