@Carl 

@Riley_S 

I have the same question.. 

I talked to support, and they kept telling me to rewire the switch :/. The switch works just fine through the app and from the wall, what would changing the wires around do!!?! Apparently the version I'm on (1.0.3) is the latest, but I have a hard time believing that considering the forum post below... 

  @Riley_S On the box the switch came with, it says Ver: 3.8. On the app, it reports hardware version 3.0. I've also set the double-tap to "instant on" and I'm able to reproduce the same issue...

  @Riley_S Any update on whether or not I can remove this delay?

  @SomethingSum @Riley_S  I'm here to ask the same questions. Just purchased a bunch of HS220's and the delay when clicking the physical button is unacceptable. I too have Model: HS220,  Hardware Version: 3.0 and Firmware Version 1.0.3.  I have tried the Double Tap to "Instant" still slow, I've always switched it to "none." Still slow. 3 different rooms, this is not a wiring issue or a light bulb issue. The prior regular switches with the same bulbs had no issue with instant turn on. 

I found the other forum with the Beta Firmwares but are the Beta Firmwares not for our versions? Are the HS220's I purchased supposed to be instant? They're not. Thanks. 

  @Lighthearted I managed to solve the issue myself by installing the beta firmware for the hardware version v1 switches. Notice how the URL for the download contains V3? That one seemingly worked for me!