All lights dim dimming and illuminate gradually when powered on and off

See this thread with the DTH for GE dimmers.

You can set the dim rate parameters for the switches. But this is not accessible through the standard Smartthings DTH. You temporarily set the DTH in the post, do your configuration and then switch it back to the standard DTH. The configuration remains in the switch.

You can set to almost instant dim up to more than 1 min.

GE 12729 Dimmer fade when issued a set level command

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