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If you know what you're doing, you can go in and charge the HV cap directly.
A typical flash has a high-voltage capacitor -- 300 to 450 volts or more -- and a circuit that boosts battery voltage to cap voltage in order to charge it.
Very expensive flashes have a way of applying 300+ volts directly to the cap (well, through a current-limiting resistor, to keep from frying things). This allows the minimum possible recharge time.
If you <i>don't</i> know what you're doing, I advise against this! There is potentially lethal voltage there!
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