Windows 11 just doesn’t speak AirPlay natively, so there’s no “switch it on” option. What worked for me was putting both my laptop and iPhone on the same 5 GHz Wi-Fi (2.4 GHz lagged like crazy), then using a lightweight AirPlay receiver app on the PC. After that, swipe down on the iPhone, hit Screen Mirroring, and it pops right up with audio.
Couple of traps I hit: the Windows firewall blocked it the first time until I allowed it, and some “free” apps out there cut you off after a minute or bombard you with ads. Stick with something simple and free, and you’ll be fine. Once you get it set, it’s totally possible to mirror iPhone to PC Windows 11 smoothly without the laggy mess you described. I’ve been using it for demos and casual streaming, and honestly it’s been solid.
So yeah—if your goal is just to mirror iPhone to PC Windows 11 with audio, keep both devices on 5 GHz Wi-Fi, don’t forget the firewall prompt, and avoid the sketchy apps that waste your time.