Watching streamers with 2k resolution enabled makes my PC lag

So, some of my favorite streamers have been using this feature that lets them stream in 2k resolution. But whenever I watch them, my pc tends to lag especially when playing games.

I can't even watch them at 2k because of location restriction. And lag still happens even when watching at lower resolutions. This doesn't happen when watching streams that haven't enabled this feature.

Idk if there's anything I can do to resolve this, or my pc is just too potato.

Hoping anyone can help me with this!🙏

My pc specs: CPU: AMD Ryzen 3 1200 GPU: AMD RX 570 (8gb) RAM: 8gb OS: Windows 10