Matt actually our problem is directly related to the patch applied here.
If we enable Pango by adding:

MOZ_DISABLE_PANGO=0

We would be able to render Urdu Pages but our Firefox would be a lot
more slower and consuming 100% cpu resources at times. I have noticed
that with Pango enabled firefox crashes quite often and that it is
certainly not an acceptable compromise.

We already have a bug report filed #54091. But the solution to our
problem lies right here. How Ubuntu decides to deal with this bug
directly affects the Urdu Font rendering and Firefox performance issues
for us.

-- 
Pango-enabled firefox is much slower
https://launchpad.net/bugs/32561

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