Have you tried a non-Chromium based browser? Firefox maybe?
It's surprising to hear that Brave is eating 15% CPU at minimum - mine reports between 0.0-0.2% CPU usage on idle. 15% seems like too much, unless your hardware is really old or perhaps Brave just isn't optimized well for Linux.
Maybe someone is spying on you specifically. Do you have another computer? Try that
maybe the federales are taking a peek.
Have you tried a non-Chromium based browser? Firefox maybe?
It's surprising to hear that Brave is eating 15% CPU at minimum - mine reports between 0.0-0.2% CPU usage on idle. 15% seems like too much, unless your hardware is really old or perhaps Brave just isn't optimized well for Linux.