With some pdf (exported from libreoffice impress) okular uses 100% of one cpu. After a long time it ends and loads correctly the pdf. Other pdf viewer (e.g. evince) work as expected (loads in 1-2 sec and without using a lot of cpu). I found that the problem seems to be this particular background. Reproducible: Always
Created attachment 87367 [details] pdf file
Same here: poppler 0.26, Okular from git/master.
This is a problem in poppler the pdf rendering library we use. Please go to https://bugs.freedesktop.org and report a bug against poppler product in the splash renderer component.