My question/fear is that I choke Homey by running a lot of flows at the same minute. Is there a risk of this? Can I somehow see that in some performance dashboard?
The amount of flows is not decisive. The complexity of flows and how many actions they are starting (especially sending data via Zigbee/Zwave/Wifi) can have an impact on CPU.
The flow processing is queued, so there can be a small delay.
In Insights (my.homey.app) you can open the CPU chart.
Put simply that is showing the amount of calls in the process queue. >1 means that more calls are waiting then processed. But if that are only peaks, then that’s ok.
I only noticed problems in sending several ZWave commands at the same time. That’s something I try to avoind with a 1sec delay in flows. But that could depend on my (small) ZWave mesh.