ZODB eating CPU but RAM is free

Hi All,

I am encountering very serious performance issues and I observed that 
mostly 100% CPU is used and RAM utilization remains less than 15%. Is there 
anyway that I can configure to increase the RAM?

The problem mostly arises when we query portal_catalog which has about 
30,000 objects.

Following is my Plone environment:

    Plone 4.3.10rc1 (4313)
    CMF 2.2.9
    Zope 2.13.24
    Python 2.7.10 
    PIL 3.2.0 (Pillow)

And this is the buildout

[zeoserver]
<= zeoserver_base
recipe = plone.recipe.zeoserver
zeo-address = 127.0.0.1:8100
zserver-threads = 8
zodb-cache-size = 200000

[client1]
<= client_base
recipe = plone.recipe.zope2instance
zeo-address = ${zeoserver:zeo-address}
http-address = 8080
zeo-client-cache-size = 128MB

Regards,
Khurram.

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