Welcome to the Cayenne Community @georgi.rizov
We have a known issue that applies only to “Raspberry Pi” and “Arduino” connected devices where many (usually in the range of 15-30) of these device types on the same account will lock up (and sometimes crash) many browsers. This is because each device is opening up its own websocket and causing slowdown. This does not apply to “Bring your own Thing”/MQTT or LoRa devices, due to a difference in the architecture. I imagine this is what you are seeing here.
The easiest solution until this is resolved is to connect your Pis as Bring Your Own Thing devices rather than through the Raspberry Pi option in the Cayenne UI. You can do this using the instructions on this page after uninstalling the Pi agent that you currently have installed from each device. You can uninstall that with the following two commands:
Alternatively, if it fits with your use case you can split the Pi’s between multiple accounts to avoid the slowdown issue.
@kreggly would this mesh with your account? (that at least some of the 23 are MQTT/LoRa, which is why you probably aren’t seeing this slowdown)