Comment 2 for bug 586599

jimav, this issue is unreproducible in LibreOffice Calc via the Terminal:

cd ~/Desktop && wget https://bugs.launchpad.net/ubuntu/+source/openoffice.org/+bug/586599/+attachment/1407325/+files/ooCPUbug.ods && localc -nologo ooCPUbug.ods

Tools -> Macros -> Run Macro -> under Library click ooCPUbug.ods -> Standard -> Module1 -> under Macro name click MYFUNC -> RUN button and notice no crash or performance issues. Does this work for you?

lsb_release -rd
Description: Ubuntu 11.04
Release: 11.04

apt-cache policy libreoffice-calc
libreoffice-calc:
  Installed: 1:3.3.2-1ubuntu5
  Candidate: 1:3.3.2-1ubuntu5
  Version table:
 *** 1:3.3.2-1ubuntu5 0
        500 http://us.archive.ubuntu.com/ubuntu/ natty-updates/main i386 Packages
        100 /var/lib/dpkg/status
     1:3.3.2-1ubuntu4 0
        500 http://us.archive.ubuntu.com/ubuntu/ natty/main i386 Packages