Should I turn on Low Power Mode on my MacBook?

Yes. Go to System Settings > Battery > Low Power Mode and set it to “Only on Battery” or “Never.” It reduces CPU/GPU performance, dims the display, and cuts background activity — giving you an extra hour or two on an M-series MacBook Air without noticeable slowdown for email or writing. Don’t leave it on forever; use it when you need it, turn it off when plugged in.