Lagging?? In what?? Day-to-day use or in some specific use case??
Day to day use
My mobile z flip 3 5g snapdragon 888
I think I phone has best processor
S21 ultra exynos...yes they lag try optimization and restart...setup weekly restart...
My s21 is snapdragon
Try changing processing speed
It's drain higher battery 🔋
Close all tabs ... do a device care, extra step clean memory it closes all background apps...put not usuable apps to sleep