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Thank you everyone for all the insight. I have tried changing over to Text::CSV_XS, and while it does produce the same output, there was no speed difference. As a test, I removed the if (!(exists)) check on the hash, and it completed in about 45 seconds, so i'm pretty sure that's where the bottleneck is. For the fun of it, I let it run overnight just to see how long it would take to run in its current state. The good news is, now that I've processed the big file with the script, subsequent files are going to be MUCH smaller... but I'm still going to be trying to get this script working more quickly. Here are the results of letting it run overnight:
perl test-urlListbyIP.pl Lines: 50000 Lines: 100000 Lines: 150000 Lines: 200000 Lines: 250000 Lines: 300000 Lines: 350000 Lines: 400000 Lines: 450000 Lines: 500000 Lines: 550000 Lines: 600000 Lines: 650000 Lines: 700000 Lines: 750000 Lines: 800000 Lines: 850000 Formatting Output... List End:1316 Execution Time: 25977.87 s
Check out that runtime!!! I'll post updates if I get it going more quickly. THanks again for all the feedback.

In reply to Re: Hash Search is VERY slow by rtjensen
in thread Hash Search is VERY slow by rtjensen

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