My Pi Zero based installation is above 50% cpu usage and I’m trying to redule the load.
I noticed that HTOP (not TOP) is reporting a second instance of dump1090-fa consuming about 15% extra (first instance consumes about 35%). Is this what is expected?
I’m feeding FA, FR24 and adsbexchange, with a single Prostick plus.
By default, htop shows threads as separate lines. You’re seeing that dump1090-fa has 2 threads running in the same process. You can change that in F2/Display Options/Hide userland process threads.
and yes, it’s normal. 
Recent updates increased CPU load, this might help:
Replace librtlsdr on Raspbian · wiedehopf/adsb-wiki Wiki · GitHub
See this thread: FYI New Pi Kernel causes dump1090-fa to run much harder
The default view of htop also shows for me three instances, however it is running only once. It is normal.
The high CPU usage comes from a different topic as wiedehopf mentioned
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