It’s not only too slow, but it also behaves differently. Have you noticed that sometimes the same gem switches colors twice? I’ve seen that happen several times. If they implement it to do it simultaneously, that won’t be possible anymore.
Only since they tweaked the gem changers last year. That’s when Gem Changers stopped affecting Loyalty gems and I have recently found Devoid gems too!!! (Energized Gems never changed color since energy was implemented)
What’s funny is also that Koth’s ability seems to ignore loyalty gems too. I am unaware whether this always happened or came with the tweak I mentioned above (I was very late to join the Koth party, and only recently started playing with him).