Hashes did the trick.

The function ends now in minutes instead of hours. I think initially I was trying to keep things ordered, when there was no real requirement to do so.

Way faster.

-TJ

In reply to Re^2: Fastest way to merge (and de-dup) two large arrays? by technojosh
in thread Fastest way to merge (and de-dup) two large arrays? by technojosh

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