My regular supplier told me that now APA102 has changed the IC, new IC can be 26KHZ PWM, higher than before.
But still many problems, voltage drop is bigger, brightness seem lower…APA company still working on it and try to improve it.
Actually I really like the NS107S seires LEDs, faster than APA102, 28Khz PWM, higher brightness, bigger chip, smaller IC…transfer speed can be 40Mhz.
Now NS107S series have 5050, 3535 and 2020 size. RGBW and 16bit will be came soon.