Have you tried resetting your router? On a computer try http://192.168.0.1 that should bring your router admin controls up. Then (if you use the password usually found on a sticker in it), you check just how many items are connected to it, you will be able to speed it up by turning un-needed devices off. You will be surprised how many are on your network. Then reboot it
Owned everything from the original Note to S22 Ultra. Disappointing that Samsung does innovate as they used to.