My Echo Room Controller relays don't all turn on or off at the same time.
When I turn all of my relays on or off at the same time, there is a slight delay between each of the relays getting to their new state.
Echo Room Controllers have a built in delay.
When multiple relays are turned on or off at the same time, there will be a slight delay between each relay getting to it's new state. This built in delay is a safety measure and cannon be adjusted or disabled. The length of time is about 100ms between each relays.