Slow Wi-Fi on My New iPhone 15 Pro Only at Home, But Works Fine Elsewhere

I just upgraded to the iPhone 15 Pro last week, and everything seems great except for one annoying issue. At home, my Wi-Fi speed is painfully slow - downloads take forever, streaming buffers all the time. But when I’m at a coffee shop or a friend’s place, the Wi-Fi speed on the same phone is perfectly fine, so I know it’s not the phone hardware itself. I’ve already restarted my router multiple times and reset network settings on the phone. I even tried toggling Wi-Fi Assist and changing the DNS servers on my phone to Google’s, but nothing really improved at home. My other devices (laptop, older iPhone) connect to the same home Wi-Fi without any trouble. Could this be some weird compatibility issue between my new iPhone and my specific router model? Or maybe a setting on the iPhone that’s throttling speeds only on certain networks? What would you recommend I try next to get my home Wi-Fi working fast again on this phone? Anyone else had a similar issue with the iPhone 15 Pro and home Wi-Fi?