I bought a Macbook Air m1 16gb two days back, and I'm seeing the same issue. I am a Flutter developer, and I mostly work on vscode and android emulator/iOS simulator and battery performance is fine as it should be. BUT whenever I go and open up xcode for editing some swift code, my battery drains like no tomorrow. I thought xcode would drain less battery than Android studio or those emulators, but NOPE, xcode drains the most battery. Dear apple, pls fix this ASAP. If I had known this I'd have bought the mac mini and be at peace with it. No wonder apple store has such low ratings for xcode.