The INA219 is a voltage, current and power measurement device. A few important maxima, see datasheet, chapter 7, esp 7.5 Datasheet states it supports 1 KHz .. 2.56 MHz. Note: higher speeds and longer ...
Another Wattmeter project is here, but this time everything is controllable digitally. We are using the INA219 as a digital device that allows the measurement of current, voltage, and therefore power.