well at least that's my guess
That's exactly my guess as well, so I'll back you up! I' don't follow it so much now, but I remember that bitcoin cash had some big difficulty adjustments (reductions) after people stopped mining, and then they all flooded back... and left again when it got more difficult, etc.
Yes, that is right BCH is faster than the original network, and it adjusted the difficulty with ease unlike the bitcoin network.
Sometimes slow because of the miners migrating from the other network.