neopixel moving dot speed with nano.

I am using a 144 led WS2812 Strip. and need to get a whit light to “shoot” across the strip very quickly.

code looks like this

#define NUM_LEDS 143

Adafruit_NeoPixel strip_a = Adafruit_NeoPixel(NUM_LEDS, 5, NEO_GRB + NEO_KHZ800);

void wrathofmom(){
for (int led = NUM_LEDS; led > 0; led–) {
strip_a.setPixelColor(led+1, 0, 0, 0);

strip_a.setPixelColor(led, 255, 255, 255);

strip_a.show();

}
wrathofmom();

any ideas to make this faster. Must USE NANO or same footprint board.

any ideas to make this faster.

You can't. You are turning off one LED and on another as fast as possible.

Could you skip every other LED?

PaulS:
Could you skip every other LED?

and light up 2 leds at a time (or in 3x) the main time is consumed by the .show() (approx 2.5ms i suspect) for a the visual effect another option is create a tail. (letting the leds behind be a tad dimmer)
And if you want the speed more finely adjustable rather than going through a pattern sequencially, set the time it takes for the pattern to complete and calculate how far in the pattern you are (supposed to be) . this does mean you clear the whole pattern everytime, but that takes hardly any time at all