On my system, the code above indexed a 6.4 million record, 5GB file in 57 seconds. 

1367141700
1367141757
6348909

[download]

Once indexed, accessing the records randomly runs at 1 second per thousand.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^3: Reading HUGE file multiple times by BrowserUk
in thread Reading HUGE file multiple times by Anonymous Monk

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