When Time Machine is backing up, my computer is so slow that it is essentially useless.  Backups occur irregularly, and take a long time.

When Time Machine is backing up, my computer is so slow that it is essentially useless.  Backups occur irregularly, and take a long time.  How do I get Time Machine to work properly?

Hello,
Have you verified both drives in Disk Utility?
See if the Disk is issuing any S.M.A.R.T errors in Disk Utility...
http://support.apple.com/kb/PH7029
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
Open Console in Utilities & see if there are any clues or repeating messages when this happens.
In the Memory tab of Activity Monitor, are there a lot of Pageouts?

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