Yes but they were considerably smaller not that long ago, with less of everything.
Such rapid expansion is extremely difficult to sustain on Dwilight. I suspect that Asylon simply hasn't been taking the time it needs to take to bring its new acquisitions fully under control. The same thing has happened to Astrum in the past when we expanded to quickly and then found our armies overextended on the northern frontier while core regions were being attacked from the Mountains of Remorse and Woe. I bet Asylon's been focusing a lot on Itau at the expense of effectively defending their middle regions from monsters. They'll probably contract by necessity while they refit their armies and then expand more systematically, with more care to bring new regions fully under control while keeping their core regions clear of monsters.
What Geronus says is basically the truth. Once Caerwyn fell our super small realm expanded like mad, we had to integrate a wack load of new nobles, we had to figure out what lands we were going to hold and switch over nobles to new regions. We then declared war on Itaulond in the middle of all that and couldn't coordinate our armies as fast as we could, since we had nobles scattered all over the place, some coming and going, some without units etc. And then the monster attacks hit us in the middle of the Itaulond war. Our army was involved in a refit and we had everyone in the Via region or Echuir so Lowervia split...blah, etc etc, we have basically gone through a whirlwind and now that Itaulond is done, we are amassing once more to retake all the lands and have an active army capable of consolidating our lands. We have a courtier army but that has been slow to build up. Basically...
Lost our northern buffer...
Gained new land...
Gained lots of new nobles...
Monster attacks started...
Declared war on Itaulond...
Lost a bunch of land...
Defeated Itaulond...
Regrouping and retaking our lands and rebuilding our army and cities etc...
So yeah, busy busy time in Asylon and lots of fun to be Asylonian in a very dynamic area of the map... Which once was considered a backwater has now become like the big smoke.