It takes a very long time to tune ATSC3 stations lately, usually 20-25 seconds on the Gigabit LAN. Tuner sharing enabled and channel tuned on a different device doesn't seem to help or hurt times. For comparison, it usually only takes 2-3 seconds with the native HDHomerun app.
ATSC3 audio recently has a high pitch annoying squeal that wasn't there in the past. For comparison the squeal is not there in the HDHomerun app or if using Emby with the with the same ATSC3 stations.