What performance boost could you possibly get? The CPU is already working at 100% calculating the number. That's why threads makes no sense in this case.

Ahem! From the OP.

i have a dual core proc

If he decided to calculate this in arbitrary precision, using both his CPU's would make a huge difference.

In reply to Re^3: how to multiply an array of number as fast as posible by BrowserUk
in thread how to multiply an array of number as fast as posible by baxy77bax

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