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I believe TBB (threaded building blocks) would utilise all cores, but maybe that is in run-time and not when compiling. I haven't fiddled with TBB myself yet.

Another thing: Make sure the charger is plugged in. My i7 laptop runs at 1.0 ghz if it is running on battery, but at a full 2.4 ghz on the charger.

A couple of somewhat related comments:

I believe TBB (threaded building blocks) would utilise all cores, but maybe that is in run-time and not when compiling. I haven't fiddled with TBB myself yet.

Another thing: Make sure the charger is plugged in. My i7 laptop runs at 1.0 ghz if it is running on battery, but at a full 2.4 ghz on the charger.