Zigbee + Qivicon stick commands per second

Hello everyone,

I’m using the latest openhabian on a raspberry 3B+ with Zigbee binding and a Qivicon USB stick (baud rate 19200). When I try to update several lights at once it takes nearly 15 seconds to switch all the 20 lights I have to another level. I was wondering whether this is a normal value, should be much faster or if it is due to the Qivicon stick and that other sticks are faster.
Would be nice to hear other timings and experiences on this topic.

Kind regards

This is not normal and I would suggest to check the logs to see what is happening. I have tested turning on 30 bulbs in about 1.5 seconds.