High CPU usage with adaptive lighting

[alsvartr]

Hi! Recently I encountered the following problem - CPU utilization increasing significantly when I turn on AL. From around 5% without AL and up to 20% with AL. Looking for advice to debug this problem (turning on debug mode in AL gives nothing interesting for me). Or perhaps there are some ways to reduce the load?
My test configuration is quite simple - AL controls a group of 3 bulbs, I did not use any specific settings.