Is it any faster to use IGNORE with Load Data Infile?

[mos]

I'm loading 100 million rows into a MyISAM table and I'm wondering what 
overhead is there when using the "Load Data Infile REPLACE " over "Load 
Data Infile Ignore" syntax.

For example, does the REPLACE do a lookup prior to inserting the row? Would 
it be faster to use Ignore? There is no possibility of having duplicate 
unique keys so I'm wondering if one syntax has a speed benefit over the 
other. TIA

Mike
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