Okular unusably slow, has extremely high CPU usage

[Christopher Forster]

The PDF was created using Adobe Acrobat X Pro and included text and graphics.

I tried to close Okular:

The window "Okular" is not responding. It belongs to the application okular (Process ID = 1764, hostname = localhost).

Do you wish to terminate the application process including all of its child windows?
Any unsaved data will be lost.

Terminate Application okular

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: okular 4:4.7.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Fri Dec 9 01:30:47 2011
ExecutablePath: /usr/bin/okular
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
SourcePackage: okular
UpgradeStatus: No upgrade log present (probably fresh install)