Maybe you’ll notice that you’ve programmed a shutter speed of 1/2000 second when you could easily get away with 1/500 second (capturing four times as many light) and a substantially lower ISO.
But whenever you have the choice, it’s best to avoid having the boost the ISO too high. Take a look at your shutter speed and aperture and see if you can capture more light in the first place. Maybe you’ll notice that you’ve programmed a shutter speed of 1/2000 second when you could easily get away with 1/500 second (capturing four times as many light) and a substantially lower ISO.