I'm confused why you think it wouldn't?

Done serially with '.'s representing time taken: 

v---------------------------------|
read........munge....insert........

[download]

versus overlapping the insert and the read in parallel: 

v-----------------------|
read........munge.....QI.
v-----------------------|
DQ.insert........Wait....

[download]

Even on a single cpu system, and with the DB running on the same box, the insert can go ahead whilst the disk head locates the next chunk of data.

It will depend upon the relative expense of the overlapped operations, but on a multi-cpu system the elapsed time should be reduced?

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.
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In reply to Re^2: Taking advantage of dual processors by BrowserUk
in thread Taking advantage of dual processors [tag://parallel,cygwin,multi-core,fork,i/o] by metaperl

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