processor load

Hi

I did a bunch of work in the summer using CA and OBS to generate puppet annotated slides. Things ran a bit hot...but no real issues. Since then I have slightly upgraded memory in my computer and CA now no longer works. Both OBS and CA have had version upgrades since then. I tested CA and OBS separately and found that CA 3.4 doesn't really work on this setup. 

Did something in the version upgrade increase base processor load? 

Is there some way I can downgrade to a previous version of CA to test if that is the problem?