in reply to Parsing Large Text Files For Performance

As you require each line to match 3 separate criteria you are effectively having to search each (matching) line 3 times.

If you have multiple cores, then you may be able to gain some performance by overlapping the searches by using separate processes to perform each of the searches: 

grep '2010' file | grep '123.456.0.1' | grep '456.321.0.1'

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