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Description of problem:
I used 10kx10k png (or jpeg) files for background and g-s consumed ~ 3GB + of free ram and oom killer was used. So it was restarted. 

Version-Release number of selected component (if applicable):
gnome-shell-3.8.4-22.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1.fiddle a bit with attached backgrounds

Actual results:
g-s gets restarted by oom killer as it eats all mem

Expected results:
lower memory consumption if < 2MB backgrounds are used

Additional info:

Created attachment 863279 [details]
1.2 MB jpeg

Created attachment 863280 [details]
317 kB png

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Not a problem on GNOME-3.14.  Memory consumption is significantly lower and g-s doesn't freeze or restart (as opposed to GNOME-3.8).

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2216.html