RE: https://mastodon.social/@saxx/117105898213804247 Mono, EQ, normalization, and de-esser are basically free (well under 1% additional CPU usage — so little that it's hard to measure). Background-noise reduction costs a bit of ANE usage and 1–2% of ongoing CPU usage on most iPhones in the last few years. You may notice a small reduction in battery life on older phones, but it shouldn't be much. It would be insignificant relative to things like leaving the screen on, streaming over a poor connection, or using the built-in speaker.