Some more suggestions on a possible workaround, from the cairo bugzilla:

https://bugs.freedesktop.org/show_bug.cgi?id=31589#c3

-- excerpt --
If you want ghosted text rendered at 0.5 alpha, then just render the text at 
0.5 alpha.  This avoids all use of the stroker. :)  There are likely other 
methods to get shadows or ghosted text suitable for you, not involving the 
stroker, so if using a temporary image surface isn't a viable option, then 
perhaps investigating those in the context of your app might be a way forward? 
Please drop by the #cairo irc channel on freenode or post to the cairo-l 
mailing list if feel like it.
-- end excerpt --

-- 
Using higher cpu usage
https://bugs.launchpad.net/bugs/655024
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