CRAWL and SEARCH killing CPU on SharePoint Index server.

I have a Index server in a MOSS2007 farm and the following two services:  MSSEARCH and MSSDMN are constantly running high for long periods (maxing out CPU) and slowing down any interactions with Index Server.

I know one is search and one is crawler (i have attached the screenshot) but am unsure where to begin with the resolution process. Any suggestions as to where i start to troubleshoot this ?


processes
paologiorgioAsked:
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Haresh NikumbhSr. Tech leadCommented:
Check your Office Search Service Indexer Performance Settings.
This happens often when the Indexer Performance is set to "Maximum" or  "Partly reduced". Try setting it to "Reduced".

The setting can be found here:
Central Administration > Operations > Services on Server > Office SharePoint Server Search Service Settings   >  Indexer Performance

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/MS-SharePoint/Q_23886206.html
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Justin SmithSr. System EngineerCommented:
This is normal behavior.  How often are crawls scheduled to run?
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paologiorgioAuthor Commented:
Incremental Crawls run daily Achilles.
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