Hi!
In the early days when looking into mode a/c with dump1090-mutability (early ~1.14 and such) there where some issues with performance for mode-S/ADSB when a/c where enabled.
Reading the changelog for dump1090-fa there seems to have been some work to mode a/c decoding since then.
Is there any downsides (performance-wise) enabling mode a/c with dump1090-fa version 4.0 on a running installation today?