Comment by altvali

Except fishnet is used to analyze broadcasted games, puzzle discovery and others. Not used when analyzing your own games. You can easily test this by opening your task manager, monitoring your CPU usage, then opening a game you played on Lichess and toggling the aptly named "local evaluation". It's the toggle bar on the upper right, next to the text "Stockfish 14+ NNUE in local browser". You will see your CPU usage increase while the evaluation is on.