I saw some complaints regarding 10.3.0 upgrade. In my case, I noticed something positive. The CPU load decreased visibly, check out the screenshots, the sudden drop matches the time when my Homey Pro was auto-updated in the middle of the night:
It actually didn’t bother me that the load was what it was, but anyway, thanks, guys!
P.S. If I go back 31 days, it does not look that great, but this is probably because I started adding dozens of devices to my otherwise empty Zigbee network on Jan 26 and Feb 4: